I'd vote for the BO if I knew what it takes to adapt a rolling block to rimless.
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I'd vote for the BO if I knew what it takes to adapt a rolling block to rimless.
Buy two bags of Dan Wesson brass or 357 max and cut a recess for the rim in the barrel.
Use your 300 blk dies .
Put some 0-rings or split washers on some 223 cases if the need arises.
Easy way.
Pamper your brass and they will last.
30 br perhaps....