No issue with stability. 1:8's will stabilise 105-108gr boat tails. Shorter, lighter 85-95gr bullets will be fine.
Accuracy... This is the same as shooting 55gr from 1:8 twist 223's. 69/77gr is probably a little tighter shooting on average, but it's more down to the particular bullet. No issue as far as you're concerned.
Terminal performance... No issue.
Only issue I've ever had was 70gr blitzkings occasionally blowing up from a 1:8 when pushed to >3400.
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