Nice shooting... I have found that the Sierra book is NEVER WRONG.
There are plenty of other books and most are helpful and useful (except the Hornady book... NEVER TRUST HORNADY DATA), but as a go to book I used Sierra and Lee for 95% of my load development.
As for 45-70 at long range... I agree past 400 yards, but up to that range I would hunt with a .458 gun any time on any game.
IF you spend your lifetime acting the victim, your Participation Trophy will ALWAYS be a Busted Nose.
I-95 "Fast Lanes" solved NOTHING!!!