I would say something loose. I don't know if you have pump or bolt. But, either gun should group consistant. If it's a bolt check your gaurd screws, plus the normal scope bases,rings etc... Trophy bond bullet's shoot around 1.5 or better 3 shot groups in at least 3 pump 7600 whelen's. For factory ammo Rem 250gr core-loc shoot the best out of my pump. At around $ 24.00 a box I feel your pain. Give your gun a good cleaning, Check all your screws. Shoot 3 shot's wait 15 min. Make sure your brl is cool. Then shoot 3-more. If your first 3 are good, your next 3 are good, then so-so, next group worse....then your gun is getting copper fouled.