Ok so it seems every time. I clean my 30-06 go to the range and send two cheap rounds through it. Then its spot on for the next (maybe) ten rounds easy with in an inch then the groups start to go to shit fast. My question is how often do you clean your barrel when trying to zero or find good ammo for your gun? Also do you think it's just me getting fatigued because I dont shoot high caliper? I bought a new 30-06 and I am hoping to draw for a cow tag this year and trying to find some ammo the gun likes.