Chuck,
Thanx for the idea of porting with an end mill....I have ported many barrels on the mill, but have always used a drill to bore "the indexed" holes....the use of an end mill makes clean up inside the bore a lot easier, and you don't get that raised ring around the hole, that is caused by the tapered point of a drill..
"I ported a 870 trap barrel for a guy that just had to have it done. I advised against it, but he would have either me or some butcher with a hand drill do it. So, I did it by copying my Browning 325 pattern, using a dividing head in my Bridgeport, and used a brand new carbide endmill to reduce the burr, then lightly honed it. The customer was very happy, even after he had shot it. I couldn't figure out why a trap gun needed recoil/muzzle jump reduction.".....Chuck H
