So last summer I reloaded a buddy of mine some 300 Win Mag rounds, and I used CCI Magnum rifle primers cause I didn't have any Fed 215M. Well since then I found and bought the Fed 215M primers and I loaded him up some more rounds this summer, and they are shooting 4" lower and 4" to the right than the rounds with the CCI primers. Is this common with just the swap of the primer? everything else in the load was the same. if anybody has any insight on this that would be great as I didn't think it would change it that drastically.
300 Win Mag loads
- Thread starter gregt9146
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ddavis83864
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Different primers will effect burn rate and pressures from a load that is the same in all other respects. changes in how the powder is ignited and burns can change velocity. These factors can cause accuracy to change.
Elkhunter24
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agree! If you change one thing with reloading, chances are it changes everything. In my experience. Good luck!!!
belly-deep
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Common? No. Possible? Yes.
Dan O
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Is the powder from the same lot?
Gunner46
Well-known member
The chamber doesn't matter. 300 Win, 30/30, 243...change a component, change the dynamics of the round, with that rifle. After you can insure that the rifle has not had some inherent mechanical alteration, then the only way to determine if the degree of variance is due to the primer is to shoot both in a single range session, under controlled conditions.
belly-deep
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Lot change in powder shouldn't cause a 4" impact shift
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