wahunterinrok Try the REAL in 320 grain for yor 50 cal. hawkens ,I would think your barrel twist would be a 1in 48 twist.
There is a guy in fla. that I myself purchase my REAL from his name is Black Jack Hill ,50 rounds run $10.00 that includes shipping ,don't forget to lube them @ pick up some wonder wads in 50 cal.