s4s4u wrote:You might be able to stuff them with Trailboss and keep the bullets held together, but it may not cycle the action.
trailboss will not cycle an ar. it doesnt produce anywhere close to the proper gas pressure curve to do so.
to the OP: listen to hoot. those berry's bullets like that are NOT meant for rifle speeds, no less those the 450 bushmaster cartridge is capable of producing.
if you were to pick a crossover application (non 45 acp) for them it would be in a mild 45 colt - think cowboy action type load. they'd still be a bit small dia wise (the colt uses .452 like our bushmaster does) but at least with it being a rimmed cartridge you could likely apply the proper roll crimp easier to get them to hold decently.
if you do run them hot enough to cycle your action in the 450 bm at the very least you're going to lead up your gun terribly, potentially clogging the entire gas system, not to mention the rifling in your barrel. they're just not engineered for that level of performance.
if you had a single shot or bolt action you could probably produce a super mild plinking load that would be tolerable. but at that point the simpler solution would be to get a 45 acp carbine (or pistol) and use them in that instead of the bushmaster. right tool for the right job and all that.
at the very least - youve got a box that has good trade value right now. with the price of pistol ammo these days.. that box you have right now is worth its weight for sure