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Accuracy loads for 7mm WSM using the Berger 140VLD

 
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  #8  
Old 08-06-2014, 02:12 PM
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Join Date: Aug 2014
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Re: Accuracy loads for 7mm WSM using the Berger 140VLD

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Originally Posted by BradinCO View Post
Thanks again for the input.
I think I learned something today and if anyone has any knowledge or experience with what I'm talking about, please let me know.
I loaded 4 different charges of Magpro and the Berger 140 VLD. I started at 72 gr. and ended up at 73.5. I chronographed all loads and here are the results:
Temp: 22, Elev: 6300:, adjusted barometric pressure: 23.9, humidity: 15%.
All loads chronographed between 3288 and 3309 and accuracy was about the same with everything. They all shot 1.5 in. or better at 200 yds.
My conclusions are:
1. This powder is sensitive to temperature and has a max. burn rate regardless of the charge when it's cold. I'll bet I don't get the same results when it's 80 and I don't see this with extruded powder.
2. I have reached the max that the barrel can burn and here again, regardless of the charge, everything that doesn't burn is simply thrown out on the snow.
Now, I'm not a scientist and don't have any technical training but these are the only two scenarios that I can come up with that would explain the consistency of the velocities regardless of the amount of powder used.
I laddered up a load with H4831SC and saw an increase in velocity with each increase in charge.... the same with IMR4831. Even though the charge weight was different, the best accuracy was attained between 3380 fps. and 3410 fps. At those velocities in the 26 1/2 in. barrel both produced groups of .75 or less at 200 yards. That, by the way, is probably as good as I can shoot at that range under those conditions.
If any of you with some technical knowledge can add some light to what I have described it would be appreciated. Even though I've been doing this quite a while, I'm still learning..... especially when it comes to long range dynamics and I'm open to comment or suggestion.
Hey everyone.....
MERRY CHRISTMAS!!!!!!!!!!!!
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  #9  
Old 09-27-2014, 10:34 PM
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Join Date: Aug 2014
Posts: 6
Re: Accuracy loads for 7mm WSM using the Berger 140VLD

I have used IMR 4831, 4831sc and and Ramshot Magnum powders. These powders r very close in accuracy. My choice is 68gr. of Ramshot. I like the way the powder flows thru my 1500 loader. My second is 4831sc. Same powder charge. I can not find any Berger 140VLD's to save my life. So I use Nosler accu-bond 140's. The burn characteristics of the 3 powders is very close. I use the 215 primer, winchester cases. Start at 66gr and work up to 68gr. 1/2 gr increments. My 7mm WSM has a 29in. barrel. Reminton 721 action, sako extractor. I found the max. load by accuracy. When the rifle shot .5in 3 shot groups at 100, I quit adding powder. My rifle the bolt was not sticky. Depending on the make of rifle and the concentration of the shooter. accuracy can b obtained. LB Schertz TX.
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