I have Parkers , Lefevers and a Colt with half fluid steel and composite barrels. I do not differentiate between the two barrel types for cartridge loads . A number 2 frame 12 ga is the most common type of a Parker that is readily available; these guns were made to shoot stout loads up to 1 1/4 oz and 3 1/4 drams. While I do not like that heavy a load, I am confident the gun will safely shoot it if I choose to.
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