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The Basics, Starting Out
Load Development
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<blockquote data-quote="Steve Shelp" data-source="post: 51835" data-attributes="member: 22"><p>Coyoter,</p><p> I would have to second Ian's suggestion about looking at other primers. I've been doing some testing lately with my 338 Lapua Imp. and have got the min/max muzzle velcoity variations down in the single digit range from 45-55fps when using the Fed215M primer. I started testing GM210M using R25 (90+gr worth) and didn't have any troubles even in temps as low as 40F. I know some guys that are giving the CCI BR and Win LR primers a serious go in competition and doing very well so far. CCI do seem to have a thicker or harder primer cup, because I do know of 2 rifles that mis-fired or hang-fire when using them. Normally a second blow on the same primer and they will go off.</p><p> In a 300 Weatherby you shouldn't have any trouble igniting powders with a standard primer and you might be surprised with the results. I got rid of the up/down in my group in my 300 Win Mag by going from 215 to 210 primers and going up 3gr using R22 powder. Then the groups shot consistantly round and th up/down tendenancy went away. I've found Federals magnum primer to be approx 2gr worth of powder in large magnum cases. So you will need to adjust your load accordingly to get your velocity/accuracy back to where it was.</p><p></p><p>Ian,</p><p> Have you used the Winchesters yourself? If so in what cases and powders? Just curious.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 51835, member: 22"] Coyoter, I would have to second Ian's suggestion about looking at other primers. I've been doing some testing lately with my 338 Lapua Imp. and have got the min/max muzzle velcoity variations down in the single digit range from 45-55fps when using the Fed215M primer. I started testing GM210M using R25 (90+gr worth) and didn't have any troubles even in temps as low as 40F. I know some guys that are giving the CCI BR and Win LR primers a serious go in competition and doing very well so far. CCI do seem to have a thicker or harder primer cup, because I do know of 2 rifles that mis-fired or hang-fire when using them. Normally a second blow on the same primer and they will go off. In a 300 Weatherby you shouldn't have any trouble igniting powders with a standard primer and you might be surprised with the results. I got rid of the up/down in my group in my 300 Win Mag by going from 215 to 210 primers and going up 3gr using R22 powder. Then the groups shot consistantly round and th up/down tendenancy went away. I've found Federals magnum primer to be approx 2gr worth of powder in large magnum cases. So you will need to adjust your load accordingly to get your velocity/accuracy back to where it was. Ian, Have you used the Winchesters yourself? If so in what cases and powders? Just curious. Steve [/QUOTE]
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