Mike, that isn't my shooting (or anyone else's for any other rifle), that is the rifle's shooting, ie shooting to the rifle's potential off of a standing rest.

With excellent barrels, excellent regulation and excellent handloads, a double ought to shoot no worse than the spread between center of bores at the muzzle plus what dispersion the barrels give. With excellent barrels, that dispersion shouldn't be much.

Recall that 1.5" grouping entails 56% less target area than a 2" group.

I'm going to follow Bramble's lead and leave further discussion, if any, to another thread so this one can return to topic.

JPK