Thread: Slow Powder, Heavy GC boolit, anyone got a ballistics calculator?

Originally Posted by Marty Henry

If thats correct its way too fast for a cast bullet, thats close to the mk 7 jacketed speed and that weighs 174 gr! It probably is unsafe and will also boot like a bastard and lead like buggery.
Visit the cast boolits website for advice otherwise look up the adi web manual it has a section on trailboss and some other powders for cast.
I used to use 15 grains of imr 4227 in a p14 behind a cast 210 gr rn which did about 1400 fps, never could get cast bullets to work ok in a 2 groove no4 though.

Yes, will likely exit barrel lighter than when it entered. Not surprised at the figures though, cast lead bullets are much easier to push through the barrel than copper jacketed bullets.

Think I'm on to the right thing here --- what with the slower gentler push of a slow powder allowing a soft bullet to be pushed faster -- but lead bullets >2000fps are hard (pun intended).

My no 4 is a two groove too. )-: