I can't seem to find any info on it but I do remember reading about swage bore (or something to that extent) rifles that had special chambers and would intentionally swage down to a signficantly smaller bore.
One thought would be a .204-19 caliber .198. have a 19 caliber barrel chambered with a 20 caliber reamer but with a little extra help in the throating to help the process. Pressure would definitely be a byproduct however, but to what extent?
but one has to ask....why?
ETA: found it "squeeze bore"
hmm reading about it brings up an interesting concept. the "little john" adapter at the end of the muzzle to swage down the projectile by ~25% but being later in the pressure cycle of the round it increased barrel life vs a traditional squeeze bore and also increased muzzle velocity and sectional density thus flying flatter and penetrating better.
I wonder if one were to thread a muzzle adapter that had gradual taper from say 22-20 or 20-17 would react? one could even use this last section with a fast twist to help spin up the now long and heavy for caliber bullet. hmm....
Last edited by squirrel_slayer; 05-31-2019 at 03:48 AM.
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