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.300wm load info?

 
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  #8  
Old 05-29-2012, 08:45 PM
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Re: .300wm load info?

Bart B wrote that well. Prep your cases as best you can, I do my hunting rounds same as match rounds. Fire your first load then just neck size until you need a slight shoulder bump, a 3 die redding set is fine, the type s bushing is better. I would start by jumping the hornadys about .060" with Imr or H 4350 with CCI BR2 or Fed210m primers, start around 68grns and work up. RE22 and 25 will give more velocity, but they are temp sensative and will give you higher extreme spreads and worse SD than the 4350s. H1000 is good in longer barrels, but the happy medium is H4831sc for speed and consistancy, on the low end I reccomend Federal match brass. With the vlds I reccomend seating them in the lands to start off.
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  #9  
Old 05-29-2012, 09:04 PM
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Re: .300wm load info?

This is what I use.

208GR Amax
79.5 Gr h1000
CCI BR2 primers

Win Brass primer pockets reamed and trimmed

COAL 3.626

.259 MOA

Haven't chronod it yet but 79 GR got me knocking on 2900 FPS at 28 degrees ambient temp.
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  #10  
Old 05-30-2012, 05:51 AM
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Re: .300wm load info?

Regarding how cases are managed for reloading them, consider what the track records been for the .300 Win. Mag.

Best accuracy competitors got with the .300 WM and Sierra Bullets gets is with proper full length sized or brand new cases. Even the benchresters have been switching over to full length sizing their smaller cases for several years. Redding or RCBS full length bushing dies seem to be the best these days. And a collet die from Innovative Technologies helps a lot to keep that ridge right in front of the belt on fired cases eliminated; it's a known cause of poor accuracy. Use a case gage so you can measure sized case shoulder headspace then adjust the full length sizing die such that the fired case shoulder's set back no more than 2 thousandths; the resized case will then headspace on the chamber shoulder and that better aligns the case neck and bullet in then chamber as the case shoulder centers perfectly in the chamber shoulder when the firing pin drives the case hard forward.

Years ago, it was quite a sight watching the military teams shooting either .30-.338 or .300 Win. Mag. brand new cases in 1000 yard matches and after winning them, giving away their once fired cases to civilians 'cause they didn't reload them. They tried conventional full length sizing (and even played with neck only sizing for some) but never got the accuracy new cases produced. Full length sizing dies don't get that tiny ridge in front of the belt sized back down to new case diameters and if that's not done, it interferec with repeatable case positioning in the chamber when the round's loaded. Larry Willis' collet die now solves that problem that used to be solved by cutting off the top and bottom of a standard full length sizing die then using that one to size fired belted case bodies al the way to the belt after a standard full length sizing die was used. I've done this with my 30 caliber magnums for long range matches and they shoot under 3/4 MOA at 1000 with both fired cases so sized and brand new cases.

You don't need to prep cases other than turning their neck walls to less than a 1/1000th spread if they're worst than that when new.
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  #11  
Old 05-30-2012, 10:49 AM
RTK RTK is offline
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Re: .300wm load info?

I never really thought about it that way. Thanks for the information, guess I will have to buy some new brass and a resizing die to try. Haven't yet shot any long range stuff, but I still like nice tight groups anyway
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