I'm shooting three or four 645's on AR's. I haven't picked up a Savage barrel yet but it is on the to do list from Black Hole. It performs out of proportion for it's size. I've shot it out to 500 in F-Class in an AR and had a good time with it.
The funny thing is it is no longer a wildcat. It was SAAMI'd on 6-18-11. The day AFTER the 6.5 Grendel, 30 AAC BLK and the 25X45 Sharps.
Greg
BTW You an push the 105's to 2650 or so with a good bolt gun. I got that out of a 24" AR but my twist rate was not fast enough at 1:9 to get it done well. The groups were large to say the least. Not battleships but not good. I will admit my testing was very limited as I see it as a 90 grain bullet round tops to start with and I personally would never go over 95. I am shooting a BHW 6X6.8 or a 243LBC if I truly want to shoot the heavy bullets but with more horsepower comes more options.
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