I know this is an older post, but I believe the "A" in 14-A means that it was chambered in the short pistol calibers , such as .38-40 or .44-40.
I was curious it you are hunting with the Model 14 this year. I also have a Model 14 in .30 Remington. Dies are available from RCBS and right now Midway USA has .30 Remington brass
. They also have .25 Remington brass which has generally been even harder to find. Good luck finding loaded ammunition. Boxes turn up from time to time on various boards, but Remington hasn't run any out of their factory for years. If you do handload, it's generally accepted to use .30-30 load data. Of course, be sure the gun is safe to shoot and work your way up from the starting loads.