Accuracy in the 17HMR is very dependent upon the ammo, and the lot # of the ammo. Since you are going to be using the rifle in the walk & stalk mode, I would not think barrel over heating would be a problem unless you get behind enemy lines, and they try to over take your position. 5 quick shots should not be a problem, but sustained fire due to them rushing your position could pose problems other than over heating the barrel.