I have used both HSM and BVAC ammunition with generally good results. The BVAC .223 69 HP has typically given 1/2 inch groups at 100 yards in an AR. The 75 gr. BTHP seem to vary a little from 1/2 inch to 3/4" depending on lots (lots shot side by side for comparison).
Results on deer for the past 2 years have been 5 instant kills for 5 shots with the 75 gr. .233 ammo.
This has been my major focus.
I recommend that function and accuracy should be verified with at least 100 rounds of any ammo before depending on it even for hunting.