A good load can still shoot badly from the wrong barrel. In a rifle the key is the rifling twist, and in a shotgun it is the barrel type and the choke. Here is how each applies to the loads in this series. Twist in rimfire rifles Twist is the rate at which the rifling turns the bullet. The .22 LR and the .22 WMR are commonly fired from barrels with a twist of about 1:16, which suits their...