I was messing around just kind of brainstorming. I put a .224" sized bullet in the cylinder from the breech side and it did not go in very far. I thought it might go all the way through with moderate resistance like when I am checking the throats on my other revolvers. I don't have pins to check throats so I use sized bullets. I understand that the barrel is likely .224 groove but I have not slugged it. I expect the chambers to be at least .224 letting the .22 lr bullets to slug up to groove diameter.
Not done playing I put the bullet in the cylinder from the barrel end and hum, it goes in easily but does not go all the way through. I guess I have some sort of crud ring in the chamber. I don't get it. I am going to clean it with a bore brush and see if it goes away.
Tim