I have not loaded any of these in a while, but occasionally I'd get a loose one after taper crimping. The use of mixed brass may have been the reason as there is probably a slight difference in the case wall thickness, enough to affect the crimp.
While it takes some experimentation to get the taper crimp just right without cracking the capsules, they worked fine for me in a snubnosed .38 Chief. Once you get it right, this method is far less trouble than any other and the cartridges are very effective on snakes to about ten feet using #9 (or smaller) shot.