Okay but YOU said that a 32 grain bullet is not much for coyotes. Sorry butit is energy and good bullet construction that kills, and the 32 grain bullet has more energy at muzzle and 100 yards than the 50 grain223 also by the time you hit 300 yards the the 204 is only about 20 ft lbs less, and at 400 yds only25 ft lbs less energyand the 32 gr has only dropped 13 inches while the 223 has dropped 21. So do your homework before making up crap. It is people like you that don't have a clue and just keep repeating crap that they here from others that does a disservice to all.
And again there is no magic powder that will not burn up barrels as fast, it is the powder charge that will improve barrel life.