And then there is concentricity. Some seating dies don't match up well with certain bullets and tend to induce runout that the handloader might not notice. Another bullet choice might load true and shoot much better.
Yep--and yet a lot of handloaders STILL never test for bullet concentricity, yet bitch about a certain bullet not shooting well.
However, a lot depends on your standards. Have mentioned before that 1-1/2", 3-shot groups at 100 yards will work for typical deer hunting (or even pronghorns) out to 300 yards or so--if the shooter's competent.
But I also know one handloader who brags that his big game rifles are "really accurate" when 100-yard groups average around 1-1/2". He also brags that he's never tested any of his handloads for bullet concentricity....
