Welcome! I read in the Beartooth manual about this before I did my guns and he had some good advice. The main thing is get the right sized egg sinkers, a good oak dowel or aluminum or brass rod as near to the bore size as you can get, and drive it through with a large hammer. According to the book you can ruin the barrel by using too small of a hammer because tapping the slug can expand (obturate) the slug without actually moving the it thus sticking it tight and possibly expanding the barrel at that spot as well. The big hammer (5lbs is not too big) and moderate blows drives the slug through by inertia. Use WD-40 or Break Free to lube the barrel first. The size eggs range from #10 down to #5, a 44 should take a 1/2 oz #8. The way I did mine was to start the sinker at the muzzle and with a hammer tap it until you get it started well and then use a short piece of oak dowel to get it past the muzzle being careful not to hit the crown with the hammer Then use the long rod (oak or aluminum, not steel) and drive it down.
