Looking to purchase a 7mm RM. I have always stuck to 'classic sporter' because I want a full length barrel. I assumed all were cut down for weight, hence, featherweight. However, All the 7mm Rem I see, be it classic sporter or featherweight seem to have 24" barrels. Is that the norm or is there something else I need to know. Is the featherweight designation purely a stop swap option on the new 90's G serial rifles?