I was preparing some cast bullets for heat treatment this morning and while swaging on the gas checks, I was reminded of some comments shared by a couple of board members and I as to whether or not the gas check constitutes a jacket. It is copper, affixed to the bullet, and travels a distance along the parallel sides of the bullet. Would it then not be just a very short jacket??
The photo below is of two 30 caliber bullets. Both weigh exactly 220 grains +/- a few tenths of a grain. I have killed big game with both of them with equal performance.
What do you all think? ~Muir