18" Proof Research - 6mm ARC build and testing - factory and handloaded ammo

[grayfox]

I need a little help here. When you say “fatter” or “bullet diameter on higher side”... this speaks to diameter, but some of what’s being said speaks to the stubby shape of the bullet tip ogive-tip. Anyone use a micrometer on their stash? Saying the comparator strikes higher or lower on the bullet, again that’s about the forward shape not diameter, which still hopefully is 0.243.
Sleekness in the front, that will definitely affect seating coal/hitting lands, but why isn’t the actual leade/chamber throat area the real issue?