 Some use reticles with marked hold overs, while others prefer reticles with a simple dot and crosshair and choose to dial long range adjustments on the turrets instead.The Tactical division is very similar to the open division, with the exception that only one optical sight is permitted, no bipod and the muzzle brake has to be within the maximum dimensions of 1x3 inches (1 inch diameter and 3 inches long).The limited division is limited to one non-magnifying red dot sight, no bipod and the muzzle brake has to be within the maximum dimensions of 1x3 inches (1 inch diameter and 3 inches long).