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Trade up now to 303brit :thumbsup:

I agree with Smiddy to an extent....what you have could do it with the right load but in the context of the highlighted text I think not.

if I wanted to be reliable at 600yrds Even the best...

1 Yes...but your muzzle velocity is marginal at best for +400y
2 perhaps a handload/custom load in the 165-180gr range of sst/eldm.
3 a lighter projectile will provide a slightly flatter trajectory...