Here is an example of a "hacksaw" rechamber quicky. Was a .260 Rem, hacksawed .250 off breech, filed square, ran 6.5 creedmoor reamer in .075 deeper than creed depth. Used 260 brass in creedmoor die to bump length...trim to 2.003. 2-1/2 grains more capacity than CM and shoots ok. Barrel did have over 1000 rounds so no break in was required.
Edit: this was 5 shots at only 100 yards with Berger 130 vlds pushed with h4350.
Also .010 off with no other load developement. Velocity was 2984 ave over 5 with sd 9.1 over mag speed.
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