Many Parkers have 2 1/2" chambers while many Parkers have 2 9/16" chambers and probably an equal number of Parkers have 2 5/8" chambers. I have some of each in various gauges. I use exclusively 2 1/2" ammo in some of them while in the ones with more robust chamber wall (and forcing cone) thickness I will use 2 3/4" ammo.
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