Simple general answer, NO! Not unless it is one of the very rare late 1930's marked Parkers on the side of the barrel lug "12 gauge for 3" shells " or a modern Parker Repro marked 3". Heavy #3 frame 12 gauge fluid steel Parkers can be used with 3" Magnum ammunition if properly chambered but I would leave this to the "experts". Use of very heavy loads in these old guns is not best practice.
Last edited by Don Kaas; 09-25-2009 at 08:54 AM..
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