Been trying to get a similar load developed but keep getting side tracked. Also have a 14 twist, 60gn partition are supposed to stabilise, only got initial load tests for these but they did appear to stabilise and would be a handy one for the odd deer. I also read the 70gn Speer was specifically developed for slow twist 222 so have some of these to try, not the most streamlined but 70gn!
If my results are no good with these then it will be back to 50gn or thereabouts similar to what you have. Tried 55 tts couldn’t get them to group. Only used 2208 so far as have a heap of it.
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