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Sensible and as you say quicker if you dont need to know the freebore

Drop a bullet in the breech, push it as far as it will go with a pencil, then stick a rod down the bore till it touches the bullet, mark the distance, tap out the bullet.
Replace it with a normal...

I shoot a lot of cast bullets in 30, 9.3, and 45 cals and most of my loads use either pistol or fast rifle powders. Im not a great fan of trailboss but have used it a bit.
All the old books i...

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....