I have read that the twist rested on the m&p 15/22 is slightly faster than the saami standard 1-16" twist. This appears to be supported by the fact that even as far out as 100yds my 15/22 will shoot feed and most importantly group with aguila's 60g sss load with no signs of keyholing evident.

As to the comments about twist rate above they are by in large incorrect. Bullet weight is only one factor in bullet stability bullet LENGTH is much more important. A short blunt 60g bullet can be stabilized quite effectively from a 1-14 twist as is the case with the old sierra smp from a 22/250, with a soft lead 22lr bullet being even shorter needing even less twist.

This group was fired at 100yds, I fired two such groups but the first one and smaller of the pair landed on my backer and not on the plate where I wanted it so its not shown.

This said I would be reluctant to shoot too many of these as the bolt velocity"felt" much faster than 36 or 40 g high velocity loads.