I'm using the .54 caliber 330 grain hard cast Harvester this year, for deer. I just went out today and shot up a box of 20. They shot as good as I am capable of with a peep sight that covers almost the entire target at 100 yards. I think the 330 grain is the ideal weight. Just heavy enough to be effective yet not so heavy that it wallops my shoulder excessively. The best thing about them is the price- 20 bullets w/sabots for $10.