What air gun are u using them in? The reason I ask is, I tried using them in my fx verminator and they proved to be useless in that gun because of accuracy. At 50 yds I was grouping them @ 11/2" inches not good enough for me. But with my cricket I got 3/8 to 5/8" standard. Because there so much more money, I couldn't afford to keep testing and throwing money out. With my cricket I believe my numbers were 780 fps not to bad. But like I said, just didn't have the rounds to keep testing. I think that with a fully rifled barrel you should have success but with fx's smooth twist, I would pass. IMHO. Hopefully, others will contest with there findings. Best regards, Steve