Thanks for the answer, the reason I asked this question is I put a tuner and brake on to see if I could tighten the groups up from 1.2 to something better and low and behold after 40 rounds and multiple settings the group didn't tighten up so I took everything off and it's back to 1.2. Then I put the Savage break back on and they opened up again. Do you think I need to put more rounds through it for accuracy to increase? Don't understand why they opened up putting on the break, pretty straight forward install.