I have personally observed the Hornady American Gunner 6.5CM ammo perform very well in a few different rifles, including a Seekins SP-10.i was not a big fan of it not as good as even the American gunner hornady ammo . I got better results from it than I did from snb ammo but not much better .it should do you well just to spank steel , and it's 100 % more fun than pointing you gun and yelling bang and a second later follow it up with yelling ding lol