I just tried 68 HHT in my 22 creed last weekend they were way faster than I expected. I was using h4350 I worked up from 41.6 grains at 3700 fps and stopped at 3800ish because of pressure. I'll have to back off a little bit more and try them again. I was working up in .4 grain increments and the first 3 were under .2" at 100 yards. 24" benchmark 1-8 twist .120 freebore.