got a 243 rem. model 7 last week.went to shoot with 3 diff. loads 57 gr 80gr and 100 gr.could not group any well at 100 yards . i think their may be a barrel problem.also the shots on the paper looked more like tears of about 3/4 in.shot my 30.06 in the same indoor tube range with no problems and they left clean holes. shot the gun the next day and still would not group better than 6 in.and all over. any ideas?