Thanks for info.
Tested another batch of older (yellow box) 168gr in the .280 in the last week, using a number of suitable powders, two depths some distance apart; 20 thou off and 80 thou off. All loaded to a predicted similar barrel time.
I saw a fair bit of variation in the groups. Re-25 at 0.080" gave 1/2moa through to 2213SC at the shorter 0.020" jump for 2.5moa. Re-22, N560 and so on all in between. The difference in group size between these two bullet jumps for a given powder was similar to the difference between powders for a given jump. So I've pretty much answered my own question.
Surprised I didn't get much feedback on this when many of the more experienced on this site load these, and given these would be one of the more finicky style of projectiles to load for - shared experience would benefit us all.
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