Caliber choice for 600 yards

I have a 300 nm that is easy to load for, and Lapa brass is $1.75 each at Mid way now. I use an 11 twist barrel and Berger 210 gr. bullets. I load N570 and get 3220 fps. with no signs of pressure with a 28" barrel. It is a tack driver, perfect out to and over 600 yards.
 
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