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The advantage of a magnum rifle beyond 500 yards for me is wind drift. I have a rangefinder to know how far it is, and try to read mirage, but it`s shifting wind that gets me far more than range. I can put eggs out at 600 yards and shoot at them with my .308 heavy barrel, and then switch to the 30-378, and while both shoot the same groups on a very calm day at 600 yards, if there is any wind, my hit ratio with the .308 is about half what it is with the 30-378.
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