Don't know about the rifling details. Mine shoots a noticibly tighter group with the steel-cased Wolf 9mm, then Remington and Federal. Winchester is the least accurate, though all shoot well for a basic carbine. I've always used 115 grain FMJ - don't know how it would do with reloads or non-FMJ bullets.
The Wolf ammo clocks faster on the chrony, and I can feel the stiffer recoil. The fact that this cheap ammo is more accurate is a bonus! :right:
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