Just for grins the other day I tracked my groups at start and end. Axis II .223 HB. 100yds, really calm day, about 40F.

First group was .6" and was .75" above aimpoint. Last group (after about 40 rounds and barrel too hot to touch) was a ragged hole about .3" and about .9" above aimpoint.

Yes, this rifle loves 69gn SMK's and Varget powder. 200yd group was 1.3"