have some 68gr bthp,moly coated,and some
win748,looking some info on amount of powder to start.My rifle is a Colt Hbar Match,with
the 1-7 twist. Thanks

Hornady manual says 23.4 to 25.8, not moly or a boat tail bullet though,Sierra manual says 24.2 to 26.8 with 69 Matchking hpbt with 748....gives you a place to start BA

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"It has been my experience that nothing improves the disposition of a scoundrel like hanging him." Andrew Jackson

My 1:7 colt was very finicky--then I tried some of the hornadies and it shot very well.
I think I was using varget but expect 748 to work good too!! Good luck