RE 1: ??
RE 2: Check the wind drift at 1300 - 1500 yards for the loads you might consider for each of the choices. The cartridge with the least drift is the cartridge to go with.
CAVEAT: Go with the cartridge with the least recoil when the drift difference is less than about 1/2 MOA. One’s ability to shoot precisely is better served by reduced recoil when the drift is within the likely accuracy envelope.
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