G'Day Fella's,

I would firstly like to say, that I have absolutely no experience with this or any other truly Big Bore cartridges but according to the 2010 Woodleigh catalog, all 0.510" bullets designed for the .500 Jeffery are designed to expand at an impact velocity (IV) of 1800 to 2200 fps!
The only exception to this, is the 600 grain PP SN, with a IV range of 1800 to 2250 fps.

Hope this is of some help and Good Hunting!

HooRoo
From
Hammer