Sam,
You're going to LOVE that Montana 243.
Mine is the least finicky of all my Montanas. Bought it used off Dan, and it has shot everything.
I had a bunch of factory 243, and it is sub-moa with:
58g Hornady
80 TTSX (Blanked out on the load - have to look it up...Kinda embarrassing, really.)
100 Fed Blue Box (that I bought from $8-14 just about every time I saw a few of the same lot # at Wal-Mart - not regretting that now)
95 Fusion
100 Fed Prem. Partition
Just to name a few...It's a lazer with lots of stuff - especially those 58-80's.
I need to tote it more.
My Montana 7-08 does not work and play well with others, though...grin.
DJ