My experience is that the standard 6.5 chamberings can be slow killers at or over 400 yards. With a short barrel, more so. If I was often shooting 300 - 600 yds I would want something with a bit more oomph through a heavier bullet than 130-140 of the 6.5. An 18"-20" .284 and 160 grn bullet at 2,800 -2,900 fps will suit that nicely.
I've seen Craigc's .284 used enough to know I would prefer it at 400 yds to my 6.5.
Just this one boy's opinion though.
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