what model? (we talking an FV or FP heavy barrel gun, or one fo the lighter, hunter styles?)
and if an FP, or other heavy barrel target/vamint/tactical model is it a 2003 model and equipted with the Accu-trigger??
this DOES make a difference,
the Accu-trigger equipted models have a different receiver profile from the others, (think they went to rounded top profile front and rear, instead of round front with flat rear, but possibly i have it backwards.) and therefore the new style guns will NOT accept the mounts from last year!!
if the gun is the newer style, you're pretty much stuck with weaver two-piece mounts, as it will require two "front" mounts. though possibly by now Leupold, or someone else may have made a one-piece, but i doubt it.
if it's the old style receiver, i personally LOVED the one-piece Leupold unit i had on mine, though mine wasn't a 30-06, so no experience with that level of recoil and it's effects