Not necking up, but I use WW nickel 280 Rem brass in my 280 AI rifle. Slicker than hell, I have 150 rounds fireformed without a hint of nickel flaking. Some of it fired 3-4 times with no problems. It's also phenomenal quality brass, very consistent.
If I could find it I wouldn't be shy about trying to neck it up. After all, try 50. What's the worst that can happen? It doesn't work and flakes...flush out your sizer die and you're out the $30 for the brass. Personally I would be surprised if it didn't work.