Well, the width of the cylinder is only slightly important, but the length of the cylinder will make a difference when I'm making the pattern and molding the holster. If my dummy is for short rounds, then it throws off the fit. But thanks for the info on the ejector. If it is too long or too short when making the holster, that would also affect the final fit. I like my holsters to fit like a glove when possible, not too tight, not too loose. So, thank you.