I use the same ammo but in the 555 packs. Works great in all my .22's, including 2 Ruger 10/22's, Savage bolt, Henry lever, many Cooeys, Rem 597. Hits gophers hard and does some nasty damage- they have a really nice deep hollowpoint. I find them to be quite clean and accurate to boot. I've gone through 3 bricks this summer of this ammo and have had maybe 2 duds in total. I liked it enough to 'invest' in 19 bricks of it at $19.97 a pop.