And you can't overlook that big, blunt nose of a .600 Nitro FMJ.

http://www.woodleighbullets.com.au/images/stories/downloads/woodleigh_bullets_2014_catalogue.pdf

Personally, if i was looking for 2nd hand i'd go .577, but buying new, if theyre the same price..well..thats a hell of a decision to put on yourself which way to go!