On the initial push through at about .296 the .187 works ok. I haven't smoothed up all the little details yet but yeah , a radius on the end of the punches would probably be a good idea. When I start further sizing down I go to a smalled punch. I push them in a die until the rim hits and then punch them back out. I'm not too concerned about the case walls being a bit thicker than 22mag and the lower case volume from the base and primer as the case should be quite a bit stronger than a 22mag and I think I can just step the pressure up a bit in the TC and make up the velocity with a bit more pressure. I don't know yet and the wife has put a stop to my experiments. I retire June 1 and hope to be in Montana by July 1 where I will have a range in the front yard. What I found to be the worst part of this is figuring out how far forward of the rim to turn the case so there is enough material just forward of the web to push in without being too thick or too thin. If you go a bit too far forward the case will snap off at the head wall junction. A bit short and the pressure of trying to swage the head gets extreme. Just a bit of case head swaging in appears to be the way to go. About .125 ahead of the rim is close but may not be perfect. Any longer doesn't work but .005/.010 shorter may be better. Still experimenting. I tried annealing one but it just squished out a lump at the head wall junction.