I had 3 boxes of 300 WSM ammo at the range today. I had one Winchester Super X box of 20 and two Federal boxes (20 each) all 3 at 180 grain. I zeroed the Tikka T3 Lite 300 WSM to 50 Yards using a rest with front sandbag and two rear sandbags and the Winchester Super X ammo. Rock solid, dead center. But when I fired the Federal, it consistently seemed to fall about 1/2" to maybe 1" lower. I tried after the barrel was warmed up, then let it cool down and shot a final spread of 4 on a fresh target, a bit of a cool down between each shot, and while it was just fine left to right, it was indeed just below the bullseye in all 4 shots even though the reticle was smack in the middle of the bullseye. Is this sort of result normal? It's not a huge deal, but it just had me wondering. Even though the Winchester Super X is more expensive per box, I've had great luck with it, and only tried the Federal because it was somewhat less expensive. But given that 300 WSM is so expensive anyway, the difference is really not that big. Thanks in advance for your replies.