i do mine on the gauge itself, and have always done them with a hard blow from a rubber mallet, however, i will be refining that technique, to something a little more gorilla strong. I recently went on a 14 mile pack trip for a week and stuffed my 24" octagon mcgowen 25-06 in the scabbard and during the middle of the week i found myself screwing the bbl back down on a empty brass and using a small set of channel locks on the nut. disappointing to say the least and embarrassing with future father in law and grandpa in law judging your equiptment/build. haha all good now, now i will have it sent out to gain an ackley chamber.