I own a very large tumbler, it holds somewhere around 2000 38 cases. One day without thinking I put in about 500 45 ACP cases along with about 500 40 S&W, turned it on and let it run all night. The next morning I went to empty the tumbler and found that almost every 40 S&W case had found it's way into a 45 ACP case. I had to pull each and every one of those cases apart. After I was done doing all of them I was just a might upset about being so stupid. So I loaded the tumbler again, careful not to put 45's and 40 S&W together. This time I loaded it with 357 mag cases and 30 carbine brass. A couple of hours later when I checked the tumbler I just about soiled myself. Man oh man the language that came out of my reloading room that day would have made a sailor blush. Can you say stupid![:@]