Does anyone here shoot the 375 JDJ? I am thinking of adding that barrel to my G2 contender carbine. It is a hunt everything caliber and Jones took 19 elephants with it during its development. It has take all the game animals on earth since its introduction. It makes a good deer round as well loaded with the 200 or 220 grain Hornady flat point. I have found data for reloading the contender handgun but no velocity data for the 23 inch carbine barrel. Any info out there about this cartridge? I believe its a necked down 444 Marlin case.