Thread: Show us your Varmint rifles

Say its a 7mm projectile, a great group such as the one described has the tip of the projectiles entering the paper within a 5 mm circle, the resulting hole/cluster will have a total of 7mm added to it due to the projectile having 3.5 mm of width either side of its forward most point/tip, called a meplat.

So when you shoot a tight group measure the ragged hole from its greatest outermost edges, then subtract the calibre you are using (7mm) and you have your group size.