Reloading data has nothing whatever to do with the rifle used. Most likely the 336 was just the rifle used for the tests. Only part that matters is the length of the barrel will give different velocities. And that doesn't matter much anyway. Data from a manual will given velocities that will be different than your's too. Accuracy is what counts, not velocity.
Data for .35 Rem shouldn't be a problem though. Should be in your manual. Lots on Hodgdon's site. Limited to 180, 200 and 220 grain bullets though.
Loaded ammo isn't an issue, unless you're out where the gun shops are small. Probably won't find it easily. Do the Wal-Mart test. If they have it in town the boonie Wally Worlds will likely have it too. Cabela's has Remington 200 grain SP ammo on sale at $25.49 per 20. Remington 150's at Bass Pro for $27.19 per 20.
.35 Rem brass is kind of scarce. Not many makers. However, Midway shows Hornady brass as being currently on sale at $29.49 per 50. Graf's has their own brand on sale at $29.99 per 50. $35.99 per 50 for Hornady.