I'm new on this forum, but not on others. I've been shooting a 220 since the 80's, and I've spent plenty of time looking for the best loads. And..it seems like keith and I have had about the same experiences in going to the 63 gr Sierra SMP when the throat got a bit further away. That bullet always shot great in my rifle. When the barrel throat managed to creep further away I had a new barrel put on it. The favorite load of the old barrel was 38.5 grains of IMR4064 behind a 55 gr Nosler SBBT and then the 55 gr Nosler Ballistic Tip. I got that load from an old Gun Digest. It said that any Swift ever made was golden with that load. I tried it, and yes it was. Then with the new barrel, after some shooting, I found that the same load was terrific in the new barrel, and it still is. I just wish I could also shoot the 60 gr Nosler Partition in the rifle. It'll almost stabilize, but not quite.
