The only difference between a 6.5x284 and 6.5x284 Norma is the OAL. The cases are the same. The Norma was developed for 1000yd matches so the longer OAL helped with the long match bullets. If you were building a gun, you could build it on either length action. You would just have to seat the bullets a little deeper into the case to fit the short action.
Savage has added the 260 and the 6.5x284 to more guns this year. Now you can get them in lightweight hunter guns with nice walnut [like a CDL], and standard synthetic stock gun too.