These were mentioned on an earlier thread, so I ordered a hundred to try in my Cooper 22-250. Shooting 50 gr. Nosler, Hornady, and Sierra varmint bullets -.005 from lands in front of 38.7 gr. H380 my gun shoots consistent mid .3's 3-shot groups. Seated .001 into the lands, the JLK's shot the same. Seated -.005 off the lands they shot in the mid .2's. I called back and ordered 500. I have a chrono coming, and will report back with speed and more test groups. So far they look good. Mr. JLK tells me the BC is .302. I'm hoping to shoot to 500 yds and beyond with this load.