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Standard 22LR has a case 0.613" long, with a 40 grain bullet sitting in it, making a loaded round 1.000".

Stingers, on the other hand, have a case that is 0.750" long, with a 32 grain bullet sitting in it, again making a loaded round 1.000". The shorter bullet allows them to use a longer case (and the longer case allows more powder), while keeping to the same OAL of the cartridge.

Since the loaded Stinger is the same overall length as your standard 22LR, it works in a normal, regular, STANDARD ANSI sporting chamber.

But if your gun is a target rifle, and has a tighter "Target chamber", the extra length of the cartridge case can cause troubles.

See the difference in case length.
 

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Yup. Like Alpo posted, basically they're saying don't run Stingers through anything with a "match" or "target" chamber.

The Marlin XT-22s have standard chambers, so that will cause no problems for ya.

You might want to check the accuracy before you stock up with too many Stingers though. Some folks have reported accuracy problems when running any of the hyper-velocity rounds through Marlin's Micro-Groove barrels.
Personally, I've had one Model 60 that didn't like Stingers at all but had another that worked superbly with them. You'll have to try it in your own rifle to see how it fares with them.
 
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