02-07-2012, 07:54 PM
Bwaites has it right!
I did the calculations awhile back after poring through an awful lot of load data.
Try comparing bullets with close to the same sectional density -- the velocities should show to be somewhat closer, with the smaller diameter actually being generally faster.
That, coupled with the slightly better shape factor (smaller bullet of same sectional density is skinnier), is one of the reasons the 6mm AR shoots so flat compared to the Grendel.
I did the calculations awhile back after poring through an awful lot of load data.
Try comparing bullets with close to the same sectional density -- the velocities should show to be somewhat closer, with the smaller diameter actually being generally faster.
That, coupled with the slightly better shape factor (smaller bullet of same sectional density is skinnier), is one of the reasons the 6mm AR shoots so flat compared to the Grendel.