Most rifles should handle 3-5 shot groups without showing fliers due to barrel heat. I shoot 3 shot groups and then let it cool, 15 minutes or so on moderate heat days. Hot days I will let it cool longer between groups.

First make sure your scope mounts are secure, do not over tighten your ring screws on the scope tube as this can cause damage and problems. Secondly pick up a different style of bullet, to see if your results change. Part of the feel out procedure of any rifle is finding what it likes to chuck (bullet style, brand or grain size can all be factors). Have you cleaned the gun? If not buy yourself some good gun solvent and copper remover. Give it a full cleaning as per the instructions and see what happens. At the range try using some sandbags(if not already) to help steady the rifle-place under the stock and butt so you can concentrate on shooting technique vs holding the rifle. Also have someone watch you shoot to ensure the fliers aren't shooter error and take your time when shooting.