I purchased a 99 for just for that purpose. A have a few other 99s and they are all older ones with the rotary mag, but for the conversion, I bought a more recent 99c in 308. I just thought that would be a better way to avoid potential feeding issues, as I've read that the rotaries can be pretty finicky about feeding something they weren't originally designed for. I sent the barrel and action to Corlane Sports in Dawson Creek. They sent the barrel off to Ron Smith for the rebore. I also had Corlane do a powder coat of all the metal before sending it back to me. I set the works into a self finished camo laminate stock from gunstocksinc, and topped it with a 2.5-8x VX3 set in Leupold QD rings. It shoots very well, and I am more than pleased with it. Don't be fooled by those who suggest the .338 Federal is a better way to go. The bullet I currently use in my .358 is the Hornady Interlock 250 gr RN, but there are lots of other choices. I really like the TSX bullets, but my thinking is that a 250 gr bullet going at somewhere around 2200 fps need not be an expensive premium to do its job well.