I've killed a lot of big game with the 270 win. using a 130 gr. with a good slow burning powder, IMR-4350 or RL19 will get er done quite well. Those two powders are very good for that cartridge and bullet weight. I've made one shot kills out past 600 yds. with a 130 gr. BT using those powders. Just don't try to reduce the powder charge below minimum, best performance is mid to upper load range.