Jacob, the manufacturer doesn't specify. They just say for use with center-fire pistol calibers. I have used these before and 44 mag didn't damage it. So atleast up to 44 mag. Hope this helps.

Jacob, according to the manufacturer, this is for use with all centerfire handguns.
Stay safe & have a great day!

Champion states for all Handgun calibers. Most likely. 22lr-.44 mag. Anything more and you'll most likely damage the plates.

Hi Jacob and welcome. This is not stated on Champion's website Sir. Champion Target should be able to accurately answer this by online inquiry here : championtarget.com/contactus ------------------ Cheers and stay safe!