A point of impact with different ammo. I shoot 308 Win and 168gr A-Max with 42 gr of IMR 4046 up to 500 yards. I had to switch the bullets for a better knockout power of silhouettes on 500 yards, so I developed a load using 178 SMK with 43.3 gr of Varget. Both loads are similar velocity, BUT, the SMK loads shoot about 2-3" to the right then Amax on 100 yards. So I zero the scope, fire 20-30 shots (with pauses of course) and switch back to Amax, and they are impacting 2-3" to the left, again, 1/2" groups? Does anyone have an explanation for this change of impact sideways (and no, it's not the wind)?