wow... bad info after more bad info...
1st.. a 243 with the right twist "1-8" is a good 1200 to 1400yard gun and will out shoot a 308 in wind using 105gr,107,115gr, a 1-8 twist will shoot 87gr out to 1k
2nd.. "There really isn't a flat shooting caliber past 400-500 yards." my 260 will disagree with that with almost 1/2 the drop at 1k over a 308... my drop at 1k is 22moa... my drop at 1 mile "yes, i shoot 1 mile steel
Thunder Valley Precision » Specialized long range shooting facility " is 80moa a 168gr 308 is 120+moa at a mile.
3rd, that scope is not a over kill for long range, its just right... depending on target size... i shoot ground hogs mostly, and made kills out to 1/2 mile with a 60gr 223. for that use 16x will suck past 600y, 20x+ will take you WELL past 1k
4th, "That was my thinking on the .308. "If it's good enough for the Marine snipers" it's more than I'll probably ever need." just because the .mil uses anything, dont make it good... look at the guns that win all the 1000y shoots.. they are all 6mm or 6.5mm guns.
you are in ohio, i would look at making a trip to
Thunder Valley Precision » Specialized long range shooting facility ... info on dates here
Thunder Valley Precision - Ohio 2012 Schedule - Sniper's Hide Forums