Just a guess, I'd say it was okay. We shoot 69 grain Sierras from .223 in 9" twist barrels all the time. I'd guess that the extra velocity should help the stability enough in the slightly slower twist barrel.
It is bullet length that will determine stability, not the weight. For example, a Barnes solid copper 70gr. bullet will be somewhat longer than a conventional lead/copper 70 gr. bullet. That 1 in 10" rate should stabilize a conventional bullet but probably won't stabilize the longer Barnes bullet. If you stay with the shorter 70 gr bullets, you should be good to go...
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