For the last twelve years, I've been using a 175 gr Lee semi-wadcutter mold with the tumble lube grooves for 10mm. It's a middle of the road bullet weight for 10mm, and will be slightly on the heavy side for .40 S&W. I'm just starting to reload .40 S&W, so I don't have any real world experience to report, but based on my experience with 10mm, including some practice loads that were so mild they were .40 S&W loads (1056 fps), I'm confident the 175 gr Lee mold will work well. If possible, get the 6-cavity molds as they make bullet casting very fast and efficient.
I've been shooting these lead reloads in my Glock G20. Glock advises not to use any reloads, and not to shoot lead in the polygonal rifled barrel. I have had no problems. I use a mildly abrasive bore cleaner to quickly (two minutes) remove all the lead from the barrel. I now have a policy of resizing all cast bullets. It adds some time to the process and it isn't strictly needed with the accurate Lee molds, as long as something didn't keep the mold sprung open, or the bullet wasn't cast when slightly liquid and dropped onto the meplat to cause it to get wider. The bullet sizing serves as a nice quality assurance step, and probably benefits accuracy, too.
