I’m a big fan of the 284 Shehane, an improved 284 Win, getting 180’s up over 2950 with ease. The 7-08 is one of my favorite deer hunting cartridges, and I certainly wouldn’t recommend anyone trade a 7-08 for a 284 Win or even Shehane, even if I might recommend getting the 284 as a new purchase over the 7-08. For me, the 284’s are 100% long action cartridges, which leaves a bit to be desired against something like a 280 AI or 7RM in a long action - if a guy is after ultimate performance. It’s a dangerous game to play - you can pour on a little more from 7-08 and get to 284, then pour on a little more and get to 280, then a little more to 7RM, then 7-300, then 7 Rum, and on and on and on until we’ve left the realm of “handy, light recoiling deer rifle” in our rear view mirror.
I’m not sure there’s anything in hunting fields which can be done with a 284 which can’t done with a 7-08.