Originally Posted by pistolpete10

The only experience I've had with this was a Model 19 fired with a lot of 140 gr bullets with heavy charges, the forcing cone did not crack but was frosted looking, I think it was burnt away due to the higher heat/flame temp.generated by the heavy charges of slow burning powders, 2400/296. The gun was stolen from me or it may have cracked with more firing. This was before I was aware of a problem. I shoot 148 wadcutter loads almost exclusively in my current 19, it still looks like new after a lot of shooting.