Afy, if you want to shoot groups in the zeros, you'll have to shoot the rifle free recoil. That's with it resting on bags untouched by any part of your body except the tip of the trigger finger. Use that finger tip to lightly touch a 1 or 2 ounce trigger that's needed.
I say this 'cause us humans aren't repeatable enough to hold a rifle against our shoulder to shoot in the zeros.
I say this 'cause us humans aren't repeatable enough to hold a rifle against our shoulder to shoot in the zeros.