Those 40 grainers just zip right along, I think the factory stuff does a little over 4000fps, it is like shooting a Laser, zero it at 200 yards and hold dead on from 0 to 250 any you can't miss. I love mine, it is a 1968 Savage, I have a new custom barrel, but the factory one shoots so good I don't know why I should put it on. Larry