I did have one question for him about an apparent ommission he made:
He had a table comparing the velocity and bullet drop of .223 in 62 and 77 gr, 6.8 SPC in 110 and 115 gr, 7.62x39, and .308 at the muzzle, 200 and 400 yards.
I have to ask, why not include the 6.5 Grendel? Especially since a bunch of folks consider the Grendel to be the SPC's main competition.
Other than that, very well written and informative article group.