I have a friend who has been shooting it for years, they do have a variety of bullet weights for it, I think remmington's will be the 25 grainers. My friend has had a Cooper rifle in this chambering for a long time now, and he handloads. he uses up to 30 or 32 grain bullets I believe, loaded down to about 3300 fps, and he cranks his 25's up to about 41 or 4200 fps.