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 22LR, 22LR Match, 22LR Bentz: Difference?
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Senior Member

1831 Posts

Posted - 05/09/2007 :  02:11:48 AM  Show Profile  Reply with Quote
Can anyone explain the primary differences between a standard chamber in 22long rifle as compared to the 22LR match or Bentz chambers? Or direct me to some reading that will explain it to me. For starters I assume the match somewhat tighter then the standard, but then what is the Bentz chamber? As usual thanks for any and all input.

Senior Member

1439 Posts

Posted - 05/09/2007 :  06:34:57 AM  Show Profile  Reply with Quote

A Bentz chamber is a match chamber for a semi-automatic rifle. It is designed to provide a tight chamber similar to a match chamber but not quite as tight as a match chamber because they are used on semi-automatic rifles and have to accommodate the feeding/extraction cycle.

Bentz chambers are normally shorter than regular 22LR chambers and usually come with a warning that they will not chamber some types of 22 ammunition including Stingers or Quik Shoks because their case length is too long to allow the action to cycle. This means the bolt will not close at the breach.

Here are the dimensions of each type of chamber.

Type______Length__Mouth Dia._Throat Dia._Taper @ Throat
Bentz______0.6900"____0.2270"____0.2255"_____1.5 Taper
Match _____0.6876"____0.2267"____0.2248"
Win 52-D___0.5800"____0.2278"____0.2248"_____2.0 Taper

The "Ruger" 10/22 factory chamber is the "Sporting" chamber above.
The "Bentz" chamber is the 'match' chamber for semi-autos.
The "Match" chamber is for bolt actions.
The "Win M52-D" is a bolt action target rifle.

Hope this helps.


"If I don't see you nomore on this world, I'll meet you on the next one, and don't be late!" - Jimi Hendrix
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532 Posts

Posted - 05/09/2007 :  11:50:01 AM  Show Profile  Reply with Quote
Not to hijack the thread, but what brand rifles have bentz chambers/
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Senior Member

1831 Posts

Posted - 05/09/2007 :  12:07:35 PM  Show Profile  Reply with Quote
Heavyiron, thanks that clears up the issue for me. Ern
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Advanced Member

7656 Posts

Posted - 05/09/2007 :  12:16:17 PM  Show Profile  Reply with Quote
Originally posted by md1634

Not to hijack the thread, but what brand rifles have bentz chambers/

You would need to verify, but the 10-22 "target" model, aftermarket "target" barrels for the 10-22, 22LR target pistols are just a couple of examples that might be cut with a Bentx chamber.

Some guys like a mag full of lead, I still prefer one round to the head.
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