I have no idea if they will stabilize in a 1:12" twist. Both of those bullets work great in 1:8" twist.
PM me an address and I'll drop some in the mail and you can try them out before ordering.
Ed
"Not in an open forum, where truth has less value than opinions, where all opinions are equally welcome regardless of their origins, rationale, inanity, or truth, where opinions are neither of equal value nor decisive." Ken Howell
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