Lyman makes these as Snap-Caps and A-Zoom. Cowboy Action shooters use them a lot to practice ammo handling moves. I like the A-Zoom line better. Both make 9mm Luger. Midway USA is a usual vendor.
http://www.lymanproducts.com/azoom/index.htm
http://www.lymanproducts.com/pachmayr/
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