I want to shoot slugs from my H&R 20 gauge Topper but understand the full choke may be a little tight to do so safely.
Should I cut the barrel back until the muzzle I.D. is at modified choke diameter? If accuracy is not good at this point, cut off a little more for an open/cylinder diameter and hope for the best? I'd cut about an inch at a time using a pipe cutter to get a square cut.
BTW, what is the standard diameter for a 20 gauge modified choke?
Should I cut the barrel back until the muzzle I.D. is at modified choke diameter? If accuracy is not good at this point, cut off a little more for an open/cylinder diameter and hope for the best? I'd cut about an inch at a time using a pipe cutter to get a square cut.
BTW, what is the standard diameter for a 20 gauge modified choke?