I'm really surprised Winchester Super Target (WST) isn't more commonly used. It meters well, isn't too fast, and has enough bulk that double-charging would be difficult. I like 5gr with a MBC IDP#7 (140gr lead CFP); accurate with moderate recoil. My M&P loves 'em.
"You need only reflect that one of the best ways to get yourself a reputation as a dangerous citizen these days is to go about repeating the very phrases which our founding fathers used in the struggle for independence."
- Charles Austin Beard