IMO, the whole reason for a double rifle, is negated by the 600NE! If it is heavy enough to carry all day on the spoor, it is too light to dampen recoil. The recoil is such that it takes away the instant aimed, instant second shot! The recovery time is so slow, that if your first shot doesn't do the trick, someone else will have to shoot your game. So! To steal a phrase from 400NitroExpress, a 600NE double is as useless as tits on a tom cat!

Even the 577NE is a little much in a close encounter! The recovery time litterly makes this a single shot, for all practical purposes,on things like close, in weeds, on something like a lion, because one shot is all your likely to get, before he's chewing on your hind quarters. For cats give me a 450/400, or even a 375H&H flanged double, and on Buffalo, or Ele give me a 450NE 3 1/4", up to a 500NE in a properly weighted double rifle!

I don't even want to talk about the 700NE, unless it has wheels!