Rick is right, the norma is bigger by about 2grs. But most of the "smith's" run the 35-338. You can fire form 35-338 in a 358 norma , and not worry about norma brass. But with 50 fps or so, they're the samething. If you find someone that has the norma reamers great, but I wouldn't spend the extra reamer charge. Shop around though, if somebody has the Norma, it would worth an extra 50+ fps. O.