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Cutright wrote:I agree totally! The load I usually use is the standard 37gr LilGun. This load was much hotter than that and I worked slowly with 250gr bullets to get up to 43gr without pressure signs. I don’t think I’m burning all the powder with a 16” barrel and carbine length gas. Also the speed isn’t much different than when I was at 39 gr however I can’t argue with the accuracy.

coyote wacker wrote:

Cutright wrote:I agree totally! The load I usually use is the standard 37gr LilGun. This load was much hotter than that and I worked slowly with 250gr bullets to get up to 43gr without pressure signs. I don’t think I’m burning all the powder with a 16” barrel and carbine length gas. Also the speed isn’t much different than when I was at 39 gr however I can’t argue with the accuracy.

One thing to remember LilGun powder you compress it you will not get any gain in velocity at a point but a loss....in several different calibers with LilGun I have experienced once you start to compress velocities will not go up add more they tend to go down....those bolt guns were running in excess of 70'000 psi on test guns when velocities started to go down....
Basically you are just wasting powder and also beating up your gun....also with a AR-15 loading "HOT" a few shots you will not be paying the "REAPER" give it a regular diet and your going to pay its just when....with the large case head of the 450 BM primers should look like a 38 Special "Target" load not like a 5.56 shot in the same gun....
Remember the action on a AR-15 is made of aluminum with a bolt made of steel you start to get "HOT" loads the aluminum is going to be stressed easer than the steel bolt....also the bolt head is much thinner holding the rim of the brass less steel than a 5.56 so it is much easer to brake....I've seen several where only the barrel and the bolt minus the bolt head were salvable they were locked up tight like they were welded....

Respect the maximum pressure 38'000 psi assigned to AR-15 and you will not have any problems or hurt yourself or any one around you push it could cause a very serious injury or even death....you want to push and see what the 450 BM can do get a bolt gun and have at it should have no problem getting to 60'000 psi....