I have a S&W 642-Pro with a cylinder that accepts Moon clips. Since S&W sent me three clips with the gun I started loading some up by hand. One horribly bent clip later I was writing out a check for the Moon clip tool. It arrived today. (Now having easily bent a clip I knew to bookmark some sites I could buy replacements from!) I noticed that Midway USA had some .025 thick for some brass and some .020 for others. That's odd.... the ones S&W sent me are around .035". Well I tried one clip using different brass types. (Wow... that tool is wonderful.) But... the clip would not allow the rounds to enter the cylinder completely. Honestly, with Federal brass I could only get them half way in. Swapping out Federal for Remington, they went in further but the closest I got them to load was still 3/8" from being in the proper place to close the cylinder. I can't imagine shooters would go through this much crap to have moon clips. There's got to be something that's not quite right and my first suspicion is the clips S&W sent me. I don't know. I'm open to nearly all suggestions. If I hadn't spent the money on the tool, I'd just say screw the clips, I'll continue to use speed loaders as I have in the past. Since I'm getting ready to send off a .45 Colt cylinder to be machined for .45 ACP clips, I was really hoping the .38 clips would have worked smoothly. Is this even worth the effort? Can I expect this crap trying to load ACP in moon clips too?