What I have discovered with the other LR amunition is that one can get the same "improvement" using pointed or spitzer bullets rather than round nose. The 14/141 offset the bullet in the magazine so that the point of the bullet is not resting on the primer of the round ahead of it. I don't have one of these guns but I have shot them on numerous occasions. Maybe when I finish off my collection of M-8 and 81 rifles I'll look into their sister model.
I believe it is a bit more work than you mention to make 30 Rem brass from 30/30 brass. I don't have my cartridge conversion manual handy at the moment but I'm pretty sure it is not quite that easy. As Remington does put out the brass on occasion, it would be pretty easy to load up at those times. Last I checked, John at Gun Stop Reloading Supplies
www.gunstop.com had 30 Rem brass on hand. As I seemed to be the only one interested in this cartridge, I'd wager they still have a bit left. If not, I'd guess, but don't know, that using 6.8 Rem SPU brass would be an easier proposition as I believe it is based off the 30 Rem case. If you don't reload yet, Hornady seems to have the best price on dies and, when coupled with their incentive of free bullets, its the best deal around by far. I just ordered a set of 25 Rem dies to replace the old set I have and it wasn't too bad at $65 bucks. A Redding forming die was only $20, both from MidwayUSA. I had decent success by just running the 30 Rem cases through the 25 Rem sizing die but I did bungle one every now and then.
That lever gun I mentioned above isn't a Mossberg, its a Stevens. Why I keep thinking its a Mossberg I'll never know. I like these older, obsolete guns as they often tend to go for quite reasonable at auctions. The lack of ammo availability and little dealer/collector presence allows the "normal" guy to get a shot at these guns.