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The op mentioned "moving from 24 caliber" to shoot 120-130 gr. (264.) bullets; you might want to consider sticking with 24 cal.
Berger makes hunting bullets of 105 and 115 gr. that can be launched faster than a 260 or 6.5 Creedmoor can push the 130 gr. 6.5 bullets. That might be a bit better on the plains.
To stabilize them, of course, you would need a rifle with a quicker twist than your average 243 Win. That most likely will bring you to the new darling of shooters, the 6mm Creedmoor. All the same old arguments of 260 v. 6.5 CM will apply to 243 v. 6 CM but the bottom line is, a factory issue 243 with a common 1 in 10 twist won't stabilize those long heavy bullets with their very high BCs and SDs.
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