I have a custom 20" contender carbine barrel in 7 GNR that is the most accurate barrel I own. Reloading for the 7 GNR is simple. Shoot factory 7-30 waters and out comes a 7 GNR case. The dies I got from Gary are Redding and are a joy to reload with. Just adjust a hair above shell holder and full length resize with no fussing around with neck sizing like most cartridges. Neck tension seems perfect so just seat with desired OAL. Piece of cake. With the 30 GNR not sure if you can just fire factory 30-30. Talk with Gary. You might have to use the alternative method. Create false shoulder on virgin brass and fireform. His rechambers are first rate. Another barrel I had rechambered, Gary buffed out old caliber, custom engraved new, and reblued. No cheap over stamp.