Shot my M 640-1 for the first time a few days ago.
38 Sp +P were OK. On target at 7 yds. My reloads of
158 gr PB KSWC with 8 gr of Herco were OK but did
cause the bullets on unfired rounds to stick out and
lock the revolver up. Don't know if I can crimp them tighter.
Factory 357 Magnum rounds are to say the least a hand full!
All hit the target at 7 yds but second shots with the 357 rounds
were hard to bring back on target in any short time.
Think I'll stick to +P rounds in this revolver....