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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
Posts: 52
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: 52
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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  #10  
Old 04-06-2015, 04:20 AM
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Join Date: Aug 2014
Posts: 52
Re: Accuracy loads for 7mm WSM using the Berger 140VLD

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Originally Posted by BradinCO View Post
I'm working some loads for my 7mm WSM built with a 26 1/2 barrel on a Montana Action. The bullet I've chosen is the Berger 140 gr. VLD and I've had some good success with IMR 4831. Right now my load gives me 3400 fps. with accuracy around .5 min at 200 yards but I'm plagued by the occasional flyer. All my brass have the necks turned and are weighed. Primers used are the Federal 215M. I'm looking to develop a load using Mag Pro or maybe H4831SC. My load with IMR 4831 is 66.5 gr.
What I'm hoping to do is save a few bullets and powder in my search for a better load since both can be hard to come by at times.
If anyone has experience with those two powders I would appreciate some input.
Try the new LRX .284 140gr. from Barnes. Excellent bullet. I shoot these in my 7wsm,66.5grs 4831sc, 215m primers Winchester brass. These loads shoot bug holes at 100yrds. VLD bullets in 284 r very hard to come upon. I was tired of waiting on the VLD's and order a box of the MRX 140gr. barnes. very very satisfied. I am going to try these bullets in my 7rum. I ordered 2 more boxes before the news gets out. Does anybody shoot a 6.5 Rem. mag. I shoot Lapua bullets in this zinger. Lapua OTM Senar 108gr. bullets, 60grs Ramshot mag. 215M primers and Remington brass. .400 bug holes. The 6.5mag. is custom made. 5.5 contour Douglas barrel, 28.5in. long, varmit stock 5x20x44 Nikon.Very little recoil.The Lapua bullets r a work of art. The Berger VLD does not have anything over these Lapua bullets. Thank u.
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