The picture on the box looks a lot like a 22 LR.

The Krag I have been shooting has an 18" twist & is apparently chambered for 22 Long.  It has a very uniform .226" groove diameter, hence my interest in the diameter of the Stevens-Pope Armory bullets.  40-grain 22 LR bullets are stabilized, but the large groove diameter precludes any tack-driving accuracy.

My Winders in 22 Short have conventional bore & groove diameters but have a 25" or 26" twist.  They will chamber a 22 Long or Long Rifle with ease, but will not stabilize the Long Rifle bullet beyond about 25 yards.  At 50 yards, you cannot reliably hit a piece of 8.5 x 11 paper.

Would those of you who have target rifles in 22 Short please report on the twist?

If one of us had a Stevens chambered for the Stevens-Pope Armory cartridge, how would we know?  Twist?  Groove diameter?  Are they marked?

I just received a copy of Brophy's Krag Rifle book from Boats.  Brophy did not quite get the historical part about Stevens-Pope barrels and the National Guard or Militia units quite right, but he quoted a part of a Stevens-Pope brochure for their Krag barrels.   

Paraphrased, it goes like this: Stevens-Pope Armory cartridges had the bullets crimped in place.  Ordinary 22 Long Rifle cartridges did not have the bullets crimped in place.  Extracting a live cartridge frequently left a bullet in the chamber (and presumably powder sprinkled through the action).  Ordinary 22 LR cartridges could be used, but S-P advised the shooter or range officer to keep a cleaning rod on hand to remove stuck bullets.  The shooter was advised to make sure that the cleaning rod was straight and not bent.   

The cartridges intended for the Model 1898 Gallery Practice Rifle were put up in boxes marked "22 Cal. Krag-Armory" (if made by UMC) or ".22 U.S. Armory Gallery Practice" if made by Winchester.

If anyone has an open box of these cartridges in their collection, please measure the bullet diameters and tell me of the results.