This is all grand discussion. However, it must always be kept in mind that currently fashionable "long forcing cones" are something to be avoided in good double guns. This includes Parkers. Why? Because to make the forcing cone long, the reamer removes metal where it is most needed. And in well-struck double gun barrels, that can result in dangerously thin wall thickness. Best to stick with standard forcing cones and a bit more "felt recoil."
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