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shalafi4
Feb 20, 2011

another medical bills avatar

Wa11y posted:

Usable case capacity depends on the bullet you specify and its seating depth (case capacity - seated bullet shank). It says 35 grains H2O capacity, so it'll be something less than that.

Bullets go all the way up to 400 grains, but the closest I could find to 275 grain is a .410" 260 grain "Impala LW CFN bullet" or a .410" 283.3 grain "SAX .400 KJG BCS G0044". Either of those sound close to what you're looking for?

There's also a .411" 270 grain "DKT SpSP #409 405 Win" if I give the bullet diameter .410 instead of the .409 it defaults to. That one makes the usable case capacity 11.939 grains at 1.590" COAL.

Looks like you need to keep it around a max of 10.2 grains to keep it under 36K PSI. That's gonna give 1216 FPS from an 18" barrel, but I assume that's longer than you're using. A more realistic 6" barrel is 1028 FPS.

Reason I asked. From everything on my end the 9x39 internal ballistics wise is *really* close to the .41 magnum. So eyeballing similar weight bullets just as a sanity check.



also 400 gr bullet out of a .41 mag

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