Originally Posted by nitestalker
Gas cutting is increased dramatically when firing jacketed rounds in a fouled barrel. All lead should be removed from the barrel before shooting jacketed magnum rounds. The lead build up in the forcing cone allows gas cutting in the critical area of the barrel.
This issue isnt limited only to jacketed loads fired at close to max pressures. Case in point, years ago I spec'd and had built a ppc gun, bases on a model 10 K frame. the only ammo fired in it were target loads w/wadcutters at +/- 800 fps. After thousands upon thousands of rounds some slight gas erosion was visible inside the topstrap. Though it was slight and after several times more ammo than the average wheel gun shooter will put through any one handgun, it was evident, and not limited to my particular pistol. A few other of the competitors i regularly shot with had similar issues after many thousands of rounds using both K frames and colts.
So in reality, fire enough of any ammo eventually top strap erosion is a possiblilty, though remote with normal use.