Hi George:
How many rounds are you going to run these guns annually ? Point being if it is only a flat or 2 the juice may not be worth the squeeze. Just buy the ammo they were intended to digest. Personally I am not in favor of removing metal. Not to sound condescending but are you certain of the present chamber length ? I ask as it is possible they are 2 5/8 which would be for 2 3/4 shells.
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