collapse
For all your AR 500 steel target needs and competitive shooting events! FREE SHIPPING ON ORDERS OVER $99.00!

Author Topic: 338-378 Weatherby Questions  (Read 7074 times)

Offline high country

  • Trade Count: (0)
  • Old Salt
  • ******
  • Join Date: May 2007
  • Posts: 5132
Re: 338-378 Weatherby Questions
« Reply #50 on: April 21, 2017, 09:55:19 AM »
I've not been able to tell any difference between them and 250s other than 250s seat in loose pockets much better. I've got at least a thousand here if you want to try, but I'd just jump to 250s myself.

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #51 on: April 30, 2017, 09:01:54 PM »
Update: Pretty much settled in on these three for use with the 300 gr SMK's.  Hope to try the 285 ELD-x and the Nosler LRAB this summer when available.  The 225 Barnes TTSX may be the the winner out to 700 yards but haven't tested it yet.   

Speed in the 2850-2870 range seems to shoot best.  The RL33 can push it over 2900 but doesn't seem to help accuracy and kicks more.   

Running about 3/4 moa at 300 yards.  Not sure this factory barrel can do much better with the 3/8" jump to the lands with these.

Next to test for speed consistency among these 3 loads. 

Note: These loads are in fired brass, neck-sized only, 3.800 coal.  Full-sized brass takes somewhat less powder and Virgin new brass is much smaller and takes as much as 3 grains less for the same pressure.




« Last Edit: May 01, 2017, 12:22:37 AM by Magnum_Willys »

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #52 on: May 04, 2017, 12:50:04 PM »
Well finally got a brick of 215M match primers. Wow much hotter than the Cci 250s in this gun. All my above loads are too hot with them but showing much less velocity spread. Gotta work some new loads up with these primers.

Offline bearpaw

  • Family, Friends, Outdoors
  • Administrator
  • Trade Count: (+3)
  • Legend
  • *****
  • Join Date: Apr 2009
  • Posts: 28028
  • Location: Colville
  • "Rather Be Cougar Huntin"
    • http://www.facebook.com/DaleDenney
    • Bearpaw Outfitters
  • Groups: WFW, WSTA, WSB, WPHA, FWM, NRA, SCI, RMEF, NAHC, IOGA, MOGA, CCOC, BBB
Re: 338-378 Weatherby Questions
« Reply #53 on: May 04, 2017, 08:17:14 PM »
That's good to hear, I found them to be hotter too, I think there is more efficient powder burn because of that in the big cases! Anxious to hear your results!  :tup:
Americans are systematically advocating, legislating, and voting away each others rights. Support all user groups & quit losing opportunity!

http://trophymaps.com "Do-It-Yourself" Hunting Maps" 
http://bearpawoutfitters.com Guided, Semi-Guided, Unguided, and Drop Camp Hunts in Idaho, Montana, Utah, and Washington. Hunts with tags available (no draw) spring bear, fall bear, buffalo, cougar, elk, mule deer, turkey, whitetail, wolf!

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #54 on: May 05, 2017, 07:57:34 PM »
I tried the new Match primers out today - was windy so I only shot at 100 yards.  My first ladder test with RL33 started at 110 gr and worked up 1/2 grain at a time.  First 4 shots were in the same hole - .25 moa so I'm sold on these primers!  Gotta stretch out to 300 yards now to dial it in.  Much more predictable results with these in this big case. 

Had to drop 2 whole grains with Retumbo with these primers. 
« Last Edit: May 06, 2017, 06:18:16 AM by Magnum_Willys »

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #55 on: May 06, 2017, 02:21:37 PM »
Update:  Same story today.  110.5 gr RL33 is a tack driver.  215M Primers, 300smk are < .5 moa at 100, and < 2 inch groups at 300.   The 215M primer is very accurate with the RL33 at lower loads.  I think the CCI primers probably work better for Retumbo and N570 allowing more velocity with the 300 gr. bullet. 

Was hoping for 2900+ speed but will take 2800 and accurate for the moment.


Offline bearpaw

  • Family, Friends, Outdoors
  • Administrator
  • Trade Count: (+3)
  • Legend
  • *****
  • Join Date: Apr 2009
  • Posts: 28028
  • Location: Colville
  • "Rather Be Cougar Huntin"
    • http://www.facebook.com/DaleDenney
    • Bearpaw Outfitters
  • Groups: WFW, WSTA, WSB, WPHA, FWM, NRA, SCI, RMEF, NAHC, IOGA, MOGA, CCOC, BBB
Re: 338-378 Weatherby Questions
« Reply #56 on: May 10, 2017, 05:14:46 PM »
most excellent  :tup:
Americans are systematically advocating, legislating, and voting away each others rights. Support all user groups & quit losing opportunity!

http://trophymaps.com "Do-It-Yourself" Hunting Maps" 
http://bearpawoutfitters.com Guided, Semi-Guided, Unguided, and Drop Camp Hunts in Idaho, Montana, Utah, and Washington. Hunts with tags available (no draw) spring bear, fall bear, buffalo, cougar, elk, mule deer, turkey, whitetail, wolf!

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #57 on: May 10, 2017, 07:31:34 PM »
That plate on the lower left was 4 shots with 110, 110.5, 111, and 112 grains through basically one hole. Crazy. 

Overall two days, 6 different loads, new brass, necksized brass, full sized brass they all went into that same hole.   I guess they like that node.  :tup:

Offline Biggerhammer

  • Off-Topics
  • Trade Count: (0)
  • Frontiersman
  • *
  • Join Date: Jun 2011
  • Posts: 4474
  • Location: Central Washington
  • Powder, primer, bullet JUNKIE.
Re: 338-378 Weatherby Questions
« Reply #58 on: May 10, 2017, 08:56:06 PM »
Exellent results. I have exclusively used Federal 210M & 215M primers for many years.
The true eye sees not the despair of its victims, only the elegance of equilibrium. It's a demonstration of superior judgement.

Never mistake motion for action.

Yes.... I'm a hater!

A offer to all HuntWA members. If you don't have something nice to say. I'll say it for you.👍

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #59 on: June 29, 2017, 10:11:10 AM »
Tried the Hornady 285 ELD's today at 525 Yards - scattered all over the place with both RL-33 and Retumbo in the loads I used with the 300 SMK's.  Velocity was 40 fps higher.   

I then shot a group with 300 SMK's and 112.3 gr RL-33 that was .7 moa at 525 Yards and would have been .4 moa if I hadn't pulled that one shot to the right that I knew immediately.  I'm sticking with the SMK's.

RL33 - 112.3 and Retumbo - 104.8 around 2820-2840 are my current loads for this rifle at 500+ yards.

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #60 on: September 10, 2017, 12:16:38 PM »
Son got a chance to shoot my reloads this morning.  5 shots in a 2.5" group at 500.   
300 gr. SMK, New Unprepped brass, 215m primer, 112.4 gr RL33.  3.795 oal
Just loaded brass right outa the box.  Doesn't get much easier than that.
2837-2852 fps.    Ave 2845.   

Offline bearpaw

  • Family, Friends, Outdoors
  • Administrator
  • Trade Count: (+3)
  • Legend
  • *****
  • Join Date: Apr 2009
  • Posts: 28028
  • Location: Colville
  • "Rather Be Cougar Huntin"
    • http://www.facebook.com/DaleDenney
    • Bearpaw Outfitters
  • Groups: WFW, WSTA, WSB, WPHA, FWM, NRA, SCI, RMEF, NAHC, IOGA, MOGA, CCOC, BBB
Re: 338-378 Weatherby Questions
« Reply #61 on: September 11, 2017, 08:45:53 AM »
Son got a chance to shoot my reloads this morning.  5 shots in a 2.5" group at 500.   
300 gr. SMK, New Unprepped brass, 215m primer, 112.4 gr RL33.  3.795 oal
Just loaded brass right outa the box.  Doesn't get much easier than that.
2837-2852 fps.    Ave 2845.

That sounds great, how do you feel this bullet will do as a hunting bullet?
Americans are systematically advocating, legislating, and voting away each others rights. Support all user groups & quit losing opportunity!

http://trophymaps.com "Do-It-Yourself" Hunting Maps" 
http://bearpawoutfitters.com Guided, Semi-Guided, Unguided, and Drop Camp Hunts in Idaho, Montana, Utah, and Washington. Hunts with tags available (no draw) spring bear, fall bear, buffalo, cougar, elk, mule deer, turkey, whitetail, wolf!

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #62 on: September 11, 2017, 10:42:29 AM »
I chose it as best available 1000 yard elk bullet based on reviews from unbiased guys who see dozens to hundreds of elk shot annually and who shoot it themselves.  Yorks tests on here confirmed its a much better choice than bergers.  The only caveat is at less than 300 yards like other premium bullets it supposedly could perform erratically if shooting 3000 fps.   If I was worried about it I would shoot a factory 250 nosler out to 300 and jack it out and chamber the 300 smk for longer shots but I plan on using it at all ranges - hopefully we find out this Friday !

Offline bearpaw

  • Family, Friends, Outdoors
  • Administrator
  • Trade Count: (+3)
  • Legend
  • *****
  • Join Date: Apr 2009
  • Posts: 28028
  • Location: Colville
  • "Rather Be Cougar Huntin"
    • http://www.facebook.com/DaleDenney
    • Bearpaw Outfitters
  • Groups: WFW, WSTA, WSB, WPHA, FWM, NRA, SCI, RMEF, NAHC, IOGA, MOGA, CCOC, BBB
Re: 338-378 Weatherby Questions
« Reply #63 on: September 11, 2017, 11:03:21 AM »
I chose it as best available 1000 yard elk bullet based on reviews from unbiased guys who see dozens to hundreds of elk shot annually and who shoot it themselves.  Yorks tests on here confirmed its a much better choice than bergers.  The only caveat is at less than 300 yards like other premium bullets it supposedly could perform erratically if shooting 3000 fps.   If I was worried about it I would shoot a factory 250 nosler out to 300 and jack it out and chamber the 300 smk for longer shots but I plan on using it at all ranges - hopefully we find out this Friday !

That makes sense, I've got some other 338 bullets I can use at closer ranges...  :tup:

I'm trying to find where to buy those redding dies you said you use? Cabelas don't carry them.
Americans are systematically advocating, legislating, and voting away each others rights. Support all user groups & quit losing opportunity!

http://trophymaps.com "Do-It-Yourself" Hunting Maps" 
http://bearpawoutfitters.com Guided, Semi-Guided, Unguided, and Drop Camp Hunts in Idaho, Montana, Utah, and Washington. Hunts with tags available (no draw) spring bear, fall bear, buffalo, cougar, elk, mule deer, turkey, whitetail, wolf!

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #64 on: September 11, 2017, 11:23:41 AM »
https://www.midwayusa.com/338-378-weatherby-magnum/br?cid=8211

I use the Lee Precision neck Die and the Redding  full length sizer die every 4 or 5 reloads as needed.  But for hunting I would just load factory new brass, then neck size - one box of brass should give you 60-80 shots at least till full size needed.   Lee precision neck and seating dies give least runout and are $160.

http://leeprecision.com/custom-collet-necksizing-large-series-die-set.html

I havent found a full length die that I like yet. Most shrink neck way down then expand it back up but not enough.  now that loads dialed in plan on just new brass and neck size till wont chamber. 
« Last Edit: September 11, 2017, 11:32:20 AM by Magnum_Willys »

Offline bearpaw

  • Family, Friends, Outdoors
  • Administrator
  • Trade Count: (+3)
  • Legend
  • *****
  • Join Date: Apr 2009
  • Posts: 28028
  • Location: Colville
  • "Rather Be Cougar Huntin"
    • http://www.facebook.com/DaleDenney
    • Bearpaw Outfitters
  • Groups: WFW, WSTA, WSB, WPHA, FWM, NRA, SCI, RMEF, NAHC, IOGA, MOGA, CCOC, BBB
Re: 338-378 Weatherby Questions
« Reply #65 on: September 11, 2017, 11:59:38 AM »
https://www.midwayusa.com/338-378-weatherby-magnum/br?cid=8211

I use the Lee Precision neck Die and the Redding  full length sizer die every 4 or 5 reloads as needed.  But for hunting I would just load factory new brass, then neck size - one box of brass should give you 60-80 shots at least till full size needed.   Lee precision neck and seating dies give least runout and are $160.

http://leeprecision.com/custom-collet-necksizing-large-series-die-set.html

I havent found a full length die that I like yet. Most shrink neck way down then expand it back up but not enough.  now that loads dialed in plan on just new brass and neck size till wont chamber.

Thanks for the info, I've two boxes of new brass screaming "load me"!  :chuckle:

So you think I should get the Lee for seating bullets? If I understood correctly they want two fired brass and the bullet I want to load to custom make the die?

Are you putting any crimp on your loads?
« Last Edit: September 11, 2017, 12:26:15 PM by bearpaw »
Americans are systematically advocating, legislating, and voting away each others rights. Support all user groups & quit losing opportunity!

http://trophymaps.com "Do-It-Yourself" Hunting Maps" 
http://bearpawoutfitters.com Guided, Semi-Guided, Unguided, and Drop Camp Hunts in Idaho, Montana, Utah, and Washington. Hunts with tags available (no draw) spring bear, fall bear, buffalo, cougar, elk, mule deer, turkey, whitetail, wolf!

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #66 on: September 11, 2017, 05:55:05 PM »
I think the Hornady is good for seating, I use the redding with a micrometer top I have from another die on it which is nice.  The Lee works fine too.

I think Lee is the best for just neck sizing (only because you can't get a Redding bushing Die for this caliber)

But Just a Hornady neck and seating die for $80 should get some pretty good loads for you. 

If I was real particular ( I am) I would fire off a factory round (weatherby/norma brass) to get brass matching my chamber and send that with a 300 smk bullet to lee and have them make me a die set.  I know that will get you less than .001 runout typically if that matters. 

Offline Ziptie

  • Trade Count: (0)
  • Pilgrim
  • *
  • Join Date: Feb 2011
  • Posts: 41
  • Location: Bothell
Re: 338-378 Weatherby Questions
« Reply #67 on: October 16, 2017, 08:48:29 PM »
Great info!  I picked up a 338/378 acumark with hopes of using it as a 500 to 1000yds hunting rifle (I practice and have killed game at over 500 with my current set up).  I picked it up in a shop with a really really bad glass job, tossed the stock.  I fitted it with a new target style stock and gave it a proper glass/ free float.  I was planning on using 250gr pills but might jump up to 300 after this read.  Thanks again for posting there is not that much out there about this caliber. 

-Zip
-The harder you work, the luckier you become.

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #68 on: October 16, 2017, 11:07:49 PM »
Great info!  I picked up a 338/378 acumark with hopes of using it as a 500 to 1000yds hunting rifle (I practice and have killed game at over 500 with my current set up).  I picked it up in a shop with a really really bad glass job, tossed the stock.  I fitted it with a new target style stock and gave it a proper glass/ free float.  I was planning on using 250gr pills but might jump up to 300 after this read.  Thanks again for posting there is not that much out there about this caliber. 

-Zip

pickup an inexpensive scope level to mount on the scope.  makes a difference over 500 yards.  With a good bed job and trigger its just about finding a good load. 

Offline Ziptie

  • Trade Count: (0)
  • Pilgrim
  • *
  • Join Date: Feb 2011
  • Posts: 41
  • Location: Bothell
Re: 338-378 Weatherby Questions
« Reply #69 on: November 08, 2017, 09:19:08 AM »
Not to hi jack but I just got mine out to the range for the first time (picked it up as a barreled action in need of attention).  I glassed it into a new stock and tossed a 6-18x lue on it.  Factory 250gr partitions are at 1" at 100yds.  I am happy for its first time out, I have ordered dies and 300gr SMK, will pick up some Re 33 and start loading for it.  I still need to tune the trigger (scary light) it is hard to use. I think a clean trigger break will shave 1/4 to 3/8" off my groups with the factory 250's.  Thanks for all the great info!   
-The harder you work, the luckier you become.

Offline Magnum_Willys

  • Trade Count: (+1)
  • Sourdough
  • *****
  • Join Date: Nov 2009
  • Posts: 2348
Re: 338-378 Weatherby Questions
« Reply #70 on: December 10, 2017, 09:09:53 AM »
Did some shooting yesterday 8mph wind. Son brought his 338-378 with my custom 300 smk loads.   Cold bore, hadnt been fired since september.  First shot 1 low, 4 to the right rang the 10 steel at 994 yards.   I couldnt out shoot him with my custom Lapua.

Btw - 215m mag primers in stock at basspro as of yday. 

 

* Recent Topics

Blackpowder pistol loading. by PA BEN
[Today at 06:38:26 AM]


2017 HuntWA Christmas Gift Exchange - LIST IS CLOSED by Dan-o
[Today at 06:33:15 AM]


Poached Goat by Antlershed
[Today at 06:14:32 AM]


Dealing with backyard poop by Mark Brenckle
[Today at 05:57:12 AM]


One More to go by boneaddict
[Today at 05:44:51 AM]


WTS Browning Citori 625 Field 12 ga !! Price Drop !! by northwesthunter84
[Today at 05:43:33 AM]


minnesota-hunter-encounters-wolf-pack by wolfbait
[Today at 04:41:33 AM]


To buy arrows? by n_mathews13
[Today at 01:54:06 AM]


Which state(s) next? by Oh Mah
[Today at 01:25:57 AM]


For Sale- Ruger .270 cal DZ77 by spin05
[Today at 01:20:53 AM]


Coon by n_mathews13
[Today at 01:16:27 AM]


Where should I put my camera this winter? by yakimanoob
[Today at 12:02:17 AM]


WINGS AND YOUR SAUCES. by Armstrong
[Yesterday at 11:51:45 PM]


Dehydrator Recommendations by KFhunter
[Yesterday at 11:48:36 PM]


Salmon fishing/Not likley by hunthard
[Yesterday at 11:38:44 PM]


Trapping opportunity, Whatcom County by Humptulips
[Yesterday at 11:30:31 PM]


Kauai fishing by Barbarossa13
[Yesterday at 11:28:53 PM]


Crossbow broadheads by lokidog
[Yesterday at 11:10:22 PM]


Looking for a new bow for my son by X-Force
[Yesterday at 11:01:29 PM]


On the Edge by blackveltbowhunter
[Yesterday at 10:36:08 PM]