I dont mean to pry too much, but you are the only guy to reply so far.
I dont have any reference to 30/40 Krag in a 14" barrel. I do have info on a rifle barrel though. Its for a 24" with a 130 gr bullet, the highest velocity with a IMR powder is around 2500 fps. We will use the 3031 example that uses 42.0 grs. I look over at 30/30 and see a 130 with IMR 3031 a charge of 35 grs nets 2400 fps. Both are 24" barrels. So I ask what is the benefit of the 30/40 over the 30/30. I already have a 14" 30/30 barrel and if the Krag doesnt net me more energy then I probably should look at getting rid of it and trying something else. What do you think? Let me know. thanks Cliff