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Author Topic: 338-378 Weatherby Questions  (Read 5830 times)

Offline high country

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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

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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

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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

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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:
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Offline Magnum_Willys

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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

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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

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Re: 338-378 Weatherby Questions
« Reply #56 on: May 10, 2017, 05:14:46 PM »
most excellent  :tup:
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Offline Magnum_Willys

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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

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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.
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Offline Magnum_Willys

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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

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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

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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?
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Offline Magnum_Willys

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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

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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.
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Offline Magnum_Willys

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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

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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

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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

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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
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Offline Magnum_Willys

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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. 

 

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