I suspect just about any well built, match tuned M14 would to well at 600yds. What combination would you want for 1000yd Service Rifle competition? Barrel Twist? Gas port size? Other mods? What sort of load?
For a dedicated 1000yd rifle, you'd probably want a chopped down front sight, an undersized gas port on a 1:10 with 190gr bullets. It will work with just the shortened sight and 175's but you'll have to press them hard to get there supersonic--45 grains of Varget is one load that I've seen floating around (which would be wayyyyy too much w/ my particular batch of Varget). I haven't tried it myself.
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