When sighting in my Model 70 30.06 this past weekend, i noticed quite a difference in accuracy with different brands of ammo.. I started with 150 corelokts, and was shooting a 6" groups at 100 yrds. Then i had some 150 Winchester X that shot much better (under a 2" group at the same distance). I then put in some 165 Winchester bullets and it was all over the place. 12" off of target to be exact. left to right was off by about the same too with NO consistency at all. I just find this a little weird that it could be so far off. Now, i could have been fatiqued and the barrel could have been hot. But i just can't see how it can be so far off. Any opinions welcome. Again, new to the 30.06 (been hunting with 12 gauge for quite some time)..

I would like to use the core-lokts since i can get a box for about $8 at kmart. The winchesters XP2's are about $15 a box. Not a big deal, but i am trying to figure out why my rifle really, and i mean really, prefers one type of bullet.