Since first seeing and reading about Dakota rifles, I have dreamed of owning a Dakota Traveler with all the barrels. These are amazing take down rifles that rival Europe's finest.
I own a Cooper MDL22, Montana Varminter, in 6.5-284. This is a rebated rim cartridge. The MDL22 is a single shot rifle, so none of this is a consideration for me.
I was curious about them and browsed them a bit. This is where I found, what I guess was misinformation, about rebated rim cartridges.
There was a thread in the semi-auto forum, where, I can't remember the OP, he chambered an AR-10 in 284Win. He did have to fiddle with the mags to get them right, and he got them very right, because this rifle was spooky accurate. I think, this thread may have been where I got the idea that rebated rim cartridges had feeding issues historically.