01-17-2023, 11:07 PM
Slam fires have been known to occur although I think nowadays they are rare, but then again I don't know your AR setup. Frankly a lot of those slam-fires could have instead been b/c of light trigger pull (allowing trigger to reset/fire without locking back) - just an opinion since the double-fire-light pull issue has arisen again in some posts.
450's and #41's are best IMO but if 400's work in your - I don't know that I can say you should absolutely avoid them.
The issue with 400's is the relatively thinner metal cup, 0.020 if I recall. 450/41's have a thicker one, 0.025 so it's harder. High pressure/hot loads can pierce the 400's quicker than their thicker brothers.
I use 450's mostly in my AR-grendel and 6Arc, and #41's for 223 and BO...
But I have some 205M's for a bolt action 6Arc that appear to be the best choice, I'm going through that testing right now.
One rifle that cannot use the #41 is my howa Grendel, the firing pin apparently cannot cleanly fire them every time... so I don't use 41's in that one.
Bottom line, in today's environment you probably should use what you have, in rifles you can trust them in.
450's have been available a lot lately, so I have a bunch of them. But want to use my others where I can, too.
450's and #41's are best IMO but if 400's work in your - I don't know that I can say you should absolutely avoid them.
The issue with 400's is the relatively thinner metal cup, 0.020 if I recall. 450/41's have a thicker one, 0.025 so it's harder. High pressure/hot loads can pierce the 400's quicker than their thicker brothers.
I use 450's mostly in my AR-grendel and 6Arc, and #41's for 223 and BO...
But I have some 205M's for a bolt action 6Arc that appear to be the best choice, I'm going through that testing right now.
One rifle that cannot use the #41 is my howa Grendel, the firing pin apparently cannot cleanly fire them every time... so I don't use 41's in that one.
Bottom line, in today's environment you probably should use what you have, in rifles you can trust them in.
450's have been available a lot lately, so I have a bunch of them. But want to use my others where I can, too.