Yes the BOSS does shoot tight groups with factory ammo. I have a Composite Stalker in 7MM Mag. If all I could get is 1/2" groups out of it I would toss it the garbage. I've never gotten 3 shots into one hole yet, but I've got a few targets with 2 shots in one hole, third shot opened up group to a figure "8". One of the guys at our range has a Medalion in .308 that more than one person has shot 3 rounds into one hole at 100 yrds. The muzzle brake BOSS reduces recoil, the 7MM feels less than my .270 with light loads. As far as velocity loss, if I experiment with different powders I can get factory velocities staying within maximum powder loads. Everybody has a different opinion on accuracy. I like to know that the spot I shoot at is where I'll hit, not within a 4 1/2" circle at 300 yrds. Sure, you can get an accurate rifle from the factory (Remington, Winchester, Savage), but it's a gamble. The BOSS does take some time to tune with some loads, most of what I've tried came in within 30 shots.