Moderator: MudBug
shooter75 wrote:Ahh sorry about that. The 450 BM.
Hoot wrote:shooter75 wrote:Ahh sorry about that. The 450 BM.
Regardless of the platform, getting the 450b pushing a 250gr bullet at 2500fps requires patience and slow, methodical workup. It's not a load-n-go achievement. Assuming you have a strong reloading foundation already behind you, you can work up to a goal, but you really need some barrel length to hit that kind of velocity. Quickload puts the chamber pressure way above recommended safe level (60k psi) out of a 20" barrel to struggle to even reach 2450fps with 100% fill of H110, which it's good at predicting the performance of. That yields a 99.93 burn rate which is as good as it gets. Faster powders like Lil Gun will do better in a shorter carbine length (16") barrel but it still only reaches 2400 fps with a 100% charge while dancing with the devil at 59k psi.
I don't use a single shot or bolt action despite them being able to handle higher pressure than the original AR platform. This caliber is plenty lethal with lower velocities. Accurate too. The parent case (284 Winchester) is rated for 63k psi, so in theory (see signature) its up for the trip, but how stable is that load? Temperature factors in. Ball powders, operating in the "red zone" at one temperature, can fall over the edge when the temperature goes up. I would not attempt your goal without speaking personally with Jeff to see what magic he pulled out of his chrony getting there, but that's me.
Hoot
Al in Mi wrote:Hoot I know nothing about QL, but when you say 100% fill, is that mean the case topped off, or do they figure a certain depth for seating a bullet?
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