Board Thread:Off Topic/@comment-25396609-20170505174118/@comment-25396609-20170607151116

The limitation on pistol caliber is really dependant on where you put the magazine; if it's inside the grip (as with most semi auto models) then you cna only put as large of a bullet as can be comfortably held.

On the other hand, if you put it in front of the grip, you can get a substantially larger bullet because your hand isn't wrapped around the magazine.