I am looking for some 600grn hardcast wide flat nose bullets to load to 2000fps for a 510 kodiak lever gun made by Mic McPhearson. Can anybody help me out ? Actual bullet dia. is .510 like a 500 nitro. I'm looking to get around 5500 ft.lbs out of a 22" barrel. Would this make a good hunting gun ? I think it will be fun to shoot anyway.