In reply to:

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if I wished to build a super long range rifle, for shots, at targets, to 3000M
Any suggestions, advice would be greatly appreciated.

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Wake up your dreaming! ...... Just kidding you, but at 3000M How big is your target, a little less than an average barn?

When I read posts like this one it reminds me of a couple of GIs in a gun shop in El Paso, Texas,back in the early 60s, with one adviseing his friend, who didn't know anything about rifles, what rifle to buy,for deer season! This is what he told the guy!

" Get a "389 magnum" rifle, it will shoot absolutely flat for 1/2 mile, and then begin to rise!"

With that rifle you would have to hold low to hit your target at 3000M! (just over two miles)