Physics is physics. My answer, and his question, has nothing to do with POA.
I’m sure this has been covered ad nauseum.... Volume matters if you seat the same bullet to the same point (let’s say the neck/shoulder junction) in each case. If you load both the 260 and the 6.5 creedmoor to the same COAL of 2.810 to safely fit inside a Remington 700 short action magazine box, a 143 grain ELDX will take up much less powder room in the creedmoor case.
“There are some who can live without wild things and some who cannot.” ALDO LEOPOLD
