With risking sounding like I'm attacking the OP (and I'm NOT!!!)...
This is the kind of thread that screams why so many people are moving away from lead bullets!!! Too few take the time to figure out what they are doing either right or wrong and just move to jacketed bullets. Worse, S&W seems to be fully pandering to this crowd with the use of the new rifling they are putting in the revolvers. But the few that figure out how to slug the bore, measure the throats in each chamber, and can match alloy, lube, and pressure find that LEAD STILL KICKS BUTT!!!
AND YOU CAN MAKE THEM YOURSELF!!!
Sorry for the all caps rant. A nerve just got tweaked there. It still burns me that 158 gr LSWCHP's lead the heck out of my 637...