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**4V50 Gary** · July 5, 2013, 10:10 PM

I think it's 30-40 Krag. The barrel is a custom barrel with a short cylinder before the taper begins. That's something Ackley did for custom guns. The caliber marking would have have A.I. (Ackley Improved).

Of course, you can always do a chamber cast to see if it has the customary 40 degree shoulder of the A.I. cartridge. Even then, it should be safe to fire a normal 30-40 as they were fire formed to fit the A.I. chamber.

July 5, 2013, 10:10 PM	#3
4V50 Gary Staff Join Date: November 2, 1998 Location: Colorado Posts: 21,832	I think it's 30-40 Krag. The barrel is a custom barrel with a short cylinder before the taper begins. That's something Ackley did for custom guns. The caliber marking would have have A.I. (Ackley Improved). Of course, you can always do a chamber cast to see if it has the customary 40 degree shoulder of the A.I. cartridge. Even then, it should be safe to fire a normal 30-40 as they were fire formed to fit the A.I. chamber. __________________ Vigilantibus et non dormientibus jura subveniunt. *Molon Labe!*