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hodgedons Varget would be very accurate for the .243 and IMR7828 would be good for the .270
i also would recomend magnum primers for any 30-06 based shell casing.if using magnum primers prevents you from working up the maximun load dont worry about that.the reason for using magnum primers in the .270 is for consistant ignition not for more velocity.
the .270 is a long and slender shell casing which often in cold weather will not ignite all the powder hence accuracy problems.
if you live in Arizona or something dont worry about the magnum primers.use winchester large rifle
use winchester large rifle magnum those seem to work well in 30-06 shell casings.the federal 215 magnums are good for 300 0r 375 H&H based rounds but not the 30-06 based shells
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