Post by: stevemiller on July 15, 2015, 12:26:17 AM
Example:180 grain Nosler ballistic tip,IMR 4350 powder 70.grains. .300 Weatherby 26 in. barrel. Sammi seating depth is 3.533 or so,Im wanting to load out to 3.700 leaving .012 to the lands.
Post by: bobcat on July 15, 2015, 05:35:00 AM
Post by: b23 on July 15, 2015, 08:00:26 AM
Post by: BULLBLASTER on July 15, 2015, 08:02:20 AM
It is always important to be very careful when deviating from published load data. And a chronograph and ability to identify pressure signs is very important.
Also be careful if you are right on the edge pressure wise because changes in weather can put you over pressure very quickly including moisture in the chamber.
Post by: BNAElkhntr on July 15, 2015, 08:07:54 AM
Post by: MuleySniper on July 15, 2015, 08:13:36 AM
Post by: b23 on July 15, 2015, 08:33:47 AM
Post by: Curly on July 15, 2015, 09:24:48 AM
How much would you increase in powder when working up a load that you are seating the bullet longer than sammi C.O.A.L.?I am working on accuracy with my rifles,Some are as much as .150 away from the lands.I realize that as I load longer I am increasing the volume of the casing,and lowering cup pressure and losing velocity.I would like to get back the lost velocity.Is there a formula that a re loader could look at to know how much pressure would be there to start,So they new that the bullet would in fact come out of the barrel?
Example:180 grain Nosler ballistic tip,IMR 4350 powder 70.grains. .300 Weatherby 26 in. barrel. Sammi seating depth is 3.533 or so,Im wanting to load out to 3.700 leaving .012 to the lands.
The best answer to your question is to run the scenario thru a reloading program like quickload and it will tell you the max powder you can use. Or you can do what most people do and just look for pressure signs and then back off. Pressure signs sometimes only occur well over max pressure though, so maybe you could find a nice guy with quickload to run your scenario.
Post by: Kittman on July 15, 2015, 09:26:46 AM
Post by: Stein on July 15, 2015, 10:03:06 AM
I don't think the seating depth makes that much difference in pressure/velocity. I wouldn't adjust the powder charge at all. But if you want more velocity go ahead and increase the powder until you get pressure signs. The best tool to have is a chronograph if you want the maximum velocity possible out of that cartridge. I normally just load to the max charge in my book. But with a chronograph you would know how much you're losing with the longer seating depth. I doubt it's very much, probably less than 25 fps.
Just what I was going to say. If you are going for accuracy, you likely won't be at max velocity anyway. I don't even know what the sammi is for the cartridges I load. For my rifle, I load max that will work in the magazine and for my daughter's I load to 0.01-0.02 off the rifling.
Post by: stevemiller on July 15, 2015, 02:04:55 PM
Post by: jasnt on July 15, 2015, 02:29:17 PM
Post by: stevemiller on July 15, 2015, 02:38:36 PM
Post by: xXLojackXx on July 16, 2015, 07:47:04 AM
Post by: JackOfAllTrades on July 16, 2015, 09:23:06 AM
Do your seating depth testing first. Then work up your powder charge. Then fine tune seating depth if needed.
That's your best advice! Get accurate loads (and that's why you're seating long anyway), then fine tune charge/seating within your defined accuracy range. Is another 100fps at 100yds really worth the hassle? It's a 300wym, Not a 300Rum. Make sure that what you're loading will reliably cycle through your action. You may not want to build a single shot.. But could end up with one.
I seat out to .010" off the lands with my 30-338, for accuracy. I'm lucky to get another 100fps with the load I've worked up, but only with certain bullets. Some bullets I've tried, I lose the accuracy when I use an identical powder/charge for the same weight, Ogive seated at the same distance from the lands. -even with a bullet that has a near same base shape and total bullet length. So I stick to what works. (66.5gns of IMR4350, Hornady 180gn Interlock BTSP (because they don't make the 190 any more) 3,100fps) Yes, four - six loads on fire-formed 338win cases and I split the cases at the belt. -even with neck sizing only. So, hone your skills at recognizing pressure signs when you're max loading or extending the OACL for anything, and especially the belted magnums.
-Steve
Post by: stevemiller on July 16, 2015, 07:21:10 PM
What bullet are you shooting? its common for VLD bullets to jump .020" to .100" in order to get bughole groups. My 7mm happens to like a .030" jump. The close I get to the rifling, the bigger the groups.This info is in my first post.Jack: im trying to tighten my groups the lands are over .150 from the book C.O.A.L measurements,my groups are 2-3 inches @ 100 yards.I want better.will putting my loads closer to the lanfds do this?Ive been told yes and no in this thread.
Post by: xXLojackXx on July 17, 2015, 01:49:24 PM
Post by: jasnt on July 17, 2015, 02:29:23 PM
A .150" jump is pretty big. Try seating between .010" and .050" off the lands. I'm sure you'll find something you like.my weatherby like .181" of jump. Your rifle will tell you whàt it likes
Post by: stevemiller on July 17, 2015, 04:39:04 PM
Ran 10 rounds thru today,I am very happy.My first 3 shot group was over (I was a little nervous)1.75 @ 100 yards my fallowing (4) 3 shot groups at 100 yards can be covered with a nickel.My 5th 3 shot group could be covered with about 3/4 of a dime.Now with chronograph I measured every shot,I averaged 2845 fps. should i even worry about bringing that up to 3100 fps?Thanks for all the insight to this venture from everyone.A .150" jump is pretty big. Try seating between .010" and .050" off the lands. I'm sure you'll find something you like.my weatherby like .181" of jump. Your rifle will tell you whàt it likes
Post by: Curly on July 17, 2015, 07:07:02 PM
Post by: stevemiller on July 17, 2015, 07:21:01 PM
Post by: Curly on July 17, 2015, 08:16:05 PM
Post by: Stein on July 17, 2015, 09:25:49 PM
Going in, many people think they are going to have the bullet they want going the max speed and have under 1/2 moa. It doesn't work like that. Good news is that it doesn't matter if your bullet is 20 grains heavier or lighter or your velocity is +-100 fps as long as you shoot it well.
Post by: stevemiller on July 20, 2015, 12:01:30 AM
The deer (elk, bear, moose, whatever) will not care if it is 100 fps faster or slower. For my rifle, I ended up going with a slightly lighter bullet than I wanted just to get the best shooting round. It is what it is, load it up and be glad when you have the cross hairs on an animal that you have full confidence knowing exactly where the bullet is going.I agree they would not care but 400 fps Makes quite a bit of diff. on trajectory and energy.I loaded up 10 rounds adding 1 grain to the load (71 grains now)and now get an average velocity of 2873 (didnt come up much did it) lol.No change in accuracy.
Going in, many people think they are going to have the bullet they want going the max speed and have under 1/2 moa. It doesn't work like that. Good news is that it doesn't matter if your bullet is 20 grains heavier or lighter or your velocity is +-100 fps as long as you shoot it well.
Post by: bobcat on July 20, 2015, 12:41:29 AM
The deer (elk, bear, moose, whatever) will not care if it is 100 fps faster or slower. For my rifle, I ended up going with a slightly lighter bullet than I wanted just to get the best shooting round. It is what it is, load it up and be glad when you have the cross hairs on an animal that you have full confidence knowing exactly where the bullet is going.I agree they would not care but 400 fps Makes quite a bit of diff. on trajectory and energy.I loaded up 10 rounds adding 1 grain to the load (71 grains now)and now get an average velocity of 2873 (didnt come up much did it) lol.No change in accuracy.
Going in, many people think they are going to have the bullet they want going the max speed and have under 1/2 moa. It doesn't work like that. Good news is that it doesn't matter if your bullet is 20 grains heavier or lighter or your velocity is +-100 fps as long as you shoot it well.
Try bumping it up a couple more grains, you're still barely above 30/06 velocity. Hodgdon online shows 72.6 grains IMR 4350 as max with a 180 grain bullet. You should be able to easily reach 3,000 fps.
Post by: stevemiller on July 20, 2015, 08:55:54 AM
Post by: birddogdad on July 20, 2015, 09:24:46 AM
:yeah: yeah Im gonna go to 72 grains next 10 rounds,Still no signs of pressure.Ive seen loads as high as 77 grains with the IMR 4350 to get to the 3000 fps range so Ill just keep creeping up and watching for pressure signs.
not messing with COAL, here is some insight if you consider other bullets...
http://www.longrangehunting.com/forums/f19/berger-load-data-300-weatherby-71897/
.. as long as you aren't dropping primers after the shot... :yike:
Post by: stevemiller on July 20, 2015, 01:34:17 PM
I didnt realize some were and some were not free bore.Mine is free bore more than when it was new I might add,I never really had good groupings with it before now,but now, wow,I am so glad I got into reloading.If your not getting what you think you should be getting out of any firearm you own,You owe it to yourself to learn it or have someone you know and trust do it for you. :twocents:
Post by: JackOfAllTrades on July 21, 2015, 10:32:46 AM
"Mine is free bore more than when it was new I might add" And how are you determining this?
The only shot that really matters is the first cold bore shot. Know where that hits at various ranges. But also know where the second/third warm bore shots strike. These would be rapid right after the cold bore shot. These would be the follow up shots on big game that you don't want to lose if you didn't place the first one in the boiler. (animals do move...)
-Steve
-Edit
I looked back and see that you have a 26" barrel. I highly suggest you try Reloader 22. (There are lot of people with Weatherby mags that use Reloader 22 with great success.) But you'll have to work up your loads just the same as you're doing with the 4350.
Post by: Caseknife on July 21, 2015, 09:14:17 PM