Shot at 300y with my AR today with a 30r Pmag as a rest. It felt quite unstable and a lot of movement was noticeable with the 1-6X dialed up to 6 power. Managed 3 out of 4 hits on a IDPA target in a rather large pattern. The fourth round went who knows where. Other than adding a bipod (not where I want to go with this basic rifle) any tips on shooting prone with a 30r mag? Do MagPod magazine bases help at all? Not trying to shoot this thing like a precision rifle, just trying to be proficient as possible.