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I saw 2850 fps at the higher end of my ladder testing with the 143 eldx in my 6.5CM, but that was getting warm, presure signs were higher than that tho, but 2800 should be quite achieveable without...

I think your velocity numbers for both bullet weights are quite conservative. I'll check mt load data, but im sure i was pushing the 143gr much faster from my 20" 6.5CM

For what you want the 6.5CM or 260 rem etc is ideally suited mate. My 260 use to go pretty well with the 123 Amax out to 600 yards or so (unfortunately that rifle wouldn't stabilise anything...

I saw your youtube vid on it earlier. I'd be going 143 eld, heavier and high bc always wins out past 500 odd yards