I’m aware magnum primers are considered to be hotter and set off slower burning and double base powders more easily, what I’m unsure of is if bench rest / match primers are also hotter than a standard primer for a given caliber? How do they differ? Are match primers just getting extra QC?
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Match vs magnum primers for bench rest
- Thread starter Mean_Man
- Start date
Yes, that's pretty much it . . . more effort with QC.
Note with something like CCI's, their BR primer cups are thick skinned like their magnum primers where their standard primers are thinner skinned. This can be an issue depending on your firing pin and firing pin spring configuration.
Nah I think that covered it, mostly was wondering about primer and powder combinations with SRP .308 brass. If I want to use SRP I may want to use a Winchester or magnum primer to avoid a possible hangfire as I’ll most likely be using a double based powder.
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For my bolt .308, I've only used 3 different powder in my Lapua SRP's: AR-Comp, IMR 4064 and Accurate 4064 behind 168 SMK's, 169 SMK's, 175 SMK's and 177 SMK's. Primer's I've used: CCI-400's, CCI-450's, Fed 205M's and Remington 7.5's.
My go to load of these that I've used the most and like the best is AR-Comp pushing 169 SMK's with CCI-400 primers. I've never hand any hang fires with this load or any other with any of the primers I've used. While I've tried the CCI magnums, I didn't find any benefit in using them. . . though if I were shooting in very cold weather, I probably would. The Rem 7.5 were only recently tried and they performed ok, the CCI-400 still do better for me.
Unless you're shooting in really cold weather, I can't imagine needing to use hot primers like magnums. But. . . that'll probably depend on the powder and bullet combination you're using.
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I do recommend having experience with a wide spread of primer brands and versions and keeping some of all kinds on hand.
At the same time, you should bet on the come so to speak and keep your favorites in bulk so you don't get caught during political/economic cycles.
At the same time, you should bet on the come so to speak and keep your favorites in bulk so you don't get caught during political/economic cycles.
what I’m unsure of is if bench rest / match primers are also hotter than a standard primer for a given caliber - it dependes. CCI BR4 are mostly hotter than 450M.
other brands may be different.
and remember for all times:
not all magnum primers are hotter than standard ones,
and magnum primer from one brand can be weaker than standard primer from other brand !
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