450Bushmaster.net

Hoping someone could run quickload data on 300gr sst under 38gr lil gun 450 primers and starling brass. I have shot them in the past without pressure signs but am curious on how much pressure might be produced. Shooting out of Christensen arms ridgeline 20” and ruger scout 16”. Thank you

thealexstop wrote:Hoping someone could run quickload data on 300gr sst under 38gr lil gun 450 primers and starling brass. I have shot them in the past without pressure signs but am curious on how much pressure might be produced. Shooting out of Christensen arms ridgeline 20” and ruger scout 16”. Thank you

You didn't specify the COL. That's important for estimating the pressure.

Hoot

Sorry. 2.26

thealexstop wrote:Sorry. 2.26

In those bolt actions, IMHO you'd be better off running a longer COL to reduce the pressure (and the jump) but I hear they are more tolerant of pressure in excess of SAAMI recommendations. I only run an AR variant so I can't speak from experience.



Hoot

54k psi should still be below max for bolt guns correct? I have heard mid 60ks is where you should keep it below. Also seating the bullet to 2.35 would drop the pressure by how much? Is it a big difference?

thealexstop wrote:54k psi should still be below max for bolt guns correct? I have heard mid 60ks is where you should keep it below. Also seating the bullet to 2.35 would drop the pressure by how much? Is it a big difference?

SAAMI lists only one pressure specification for the 450b. User reports of higher safe pressures in bolt guns are anecdotal. The 284 Winchester, which is the parent case, has a yield pressure of 63.8k.
the 450b 300 SST/ML recipe pressure is predicted to drop to 45K at 2.35 COL

Hoot

Thank you hoot. Always a wealth of information.