Although the 356 Win doesn't have much more case capacity than the 35 Rem, 55 grains verses 51 grains, the advantages that I see are that the brass is much heavier and the headspace is on the rim, rather than on a very small shoulder. Also, a 35 to 356 Nonneman conversion gets you a precision cut chamber and a process that has been proven to be safe and fully functional hundreds of times over. Even if the 35 Rem +P loading program is safe, it doesn't appear (to me) to possess the additional margin of safety that a 356 conversion provides as a means by which to reach the maximum performance potential of a .358" bore cartridge in a Marlin 336.
If it sounds like I am preaching the gospel of St. Regan, I guess that I am, as I am a believer x3.
Jeff
