You may have some failures to eject/feed with .22 Longs in a P22.
I made that mistake years ago during another ammo scare and it took me a couple magazines worth of rounds through my P22 before I read the package and realized I had bought .22 Long instead of .22 Long Rifle.
For dry fire, I recommend getting some Snap Caps - they are really cheap and will protect the firing pin.
>.22lr snap caps are pretty much impossible to find
Worth noting though, that unlike any centerfire- these do wear out. They are just plastic and the firing pin puts dents in the rim, eventually just completely chewing them up to where they're not really useful
Has anyone tried these snap caps? I am looking to get these to safely dry fire a 10/22
I'm sorry, I should have brought that up. Dry firing rim fires or certain other historical weapons is a bad idea unless you use snap caps. However, they are cheap.
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https://www.amazon.com/Tipton-Snap-Caps-22-LR-x/dp/B0048KFHI8
amazon has them.. http://www.amazon.ca/dp/B0048KFHI8