Most factory 130 loads were doing around 2,850 - 2,950 about ten years back, which may have been the last time I shot any factory 270s. The light magnum loads were closer to advertised velocity.
I would look no further than the classic 130 Hndy. and 60 grains of H4831 if you want to gain some velocity. This Jack OConner load has worked in every 270 I have tried it in.
A few finicky ones might do better in velocity or accuracy with R22 but not enough of a difference to have multiple loads.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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