eaglemike

How often are you cleaning the mags? Is the match outdoors? I've seen mags need cleaning after being dropped in the dirt. I used to do a quick take apart, wipe spring and follower, pull a rag through, and reassemble when shooting matches outdoors.

Never mind then. I don't want to offend you or anyone else making 1/2 dozen spring sleeves to help some people out.

I'll be making a small batch, and will check pm's here every few days. Interesting fact, my .40 TS slide doesn't use this part. I wonder if the design changed over time.

Yes, 356 is better than .355 IMHO. 357 would be even better. again, IMO. If they are sized prior to coating, that will make a difference, as the coating will make it larger, and help limit, or eliminate leading. I know some people do it this way. Coated bullets are miles ahead of the old plain lead with lube in the groove. If possible, I prefer to shoot a slightly oversize bullet - same as some others have said. Sorry to be slow in response - I hadn't seen the notification. Lots of support from others though.

Size is super important, as others have said. I slugged several Glock barrels a while back. All the 9's measured .3565. Great for jacketed stuff, not so great for most lead sized for 9mm. I ended up running .357 moly coated, and could go a long time with no leading. Choosing an appropriate powder helps. If one uses an uncoated, undersize cast bullet with a fast powder, it going to look like someone tried to solder just ahead of the chamber. When I was early in reloading, I tried some local (way soft) .451 stuff in a G21. Didn't work well. Had another learning experience. Good luck, and stay safe!