Buffalo Nichols
US Veteran
Acossey, if the cylinder was changed it was probably for 1 of 2 reasons; the first was somehow defective or the owner wanted to change to a caliber more available at his area of the world. We may be able to determine the caliber if you can provide precise measurements of the following. Headspace; the distance between the rear of the cylinder and the standing breach ( area where firing pin comes through the frame) probabaly best done with a feeler guage ( like you used to set the points on a car with), diameter of rear of the charge holes and diameter of the front of the charge holes, a vernier caliper is best for this. With this data we can determine rim thickness, case diameter and bullet diameter to a reasonable degree. From that we may able to narrow the field some, also determine if the charge holes are drilled straight through or have a shoulder, if so determine the depth of the shoulder from the back of the cylinder.