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#518979 07/22/18 07:37 PM
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I've heard it told that people often misjudge a 2.5" chamber because they load a standard 2.75" shell in the chamber and the action closes on it. However, as we know, a standard 2.75" shell is actually closer to 2.5" when unfired and therefore should chamber without issue in a 2.5".

I've often wondered if you can therefore make a rough estimation of a standard 2.75" chamber by seeing if the action will close on a 3" shell? I don't plan on using this technique if my life depended on it, but I've just been curious if this would technically work?

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Why not just measure?...Geo

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With a bit of practice a 6" steel rule can be used to feel the start of the forcing cone and thus the length of the chamber.

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Originally Posted By: Mark II
With a bit of practice a 6" steel rule can be used to feel the start of the forcing cone and thus the length of the chamber.


That is how I do it.
Set the barrels in the vise, shine a light in the chamber. put the rule into chamber until you touch the forcing cone, read the rule at the outside edge of chamber.
O.M

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Originally Posted By: fallschirmjaeger


I've heard it told that people often misjudge a 2.5" chamber because they load a standard 2.75" shell in the chamber and the action closes on it.

I've often wondered if you can therefore make a rough estimation of a standard 2.75" chamber by seeing if the action will close on a 3" shell?




If the gun isn't properly marked as to chamber length, it could also have a 2-1/2"(2-7/16") chamber, and a 3" shell chamering isn't a relible indicator of chamber length.

Fahgetabout using the EASY button, and measure the chamber(s).


.

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I tried measuring it with the slide extension on my calipers, but I couldn't seem to feel the end of the chamber/beginning of the forcing cone.

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You could take an index card, roll it up and poke it in the chamber. When you feel the forcing cone mark the place on the card where the actual chamber starts, not the end of the breech. Unroll the card and measure...Geo

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Thanks Geo...I'll give it a try.

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I realize this is not the answer to the question originally asked but If you have access to a lathe turn down a length of hard wood or metal to a slightly smaller diameter than the chamber.
While this gauge you are making is in the lathe cut a very thin line at 2, 2 1/2, 2 3/4 inch etc. you will then have an inexpensive gauge that will last for years and will accurately measure chambers at a glance.
Of course these gauges are commercially avalible but here is a project a person could knock out in an evening and do multiple gauges.

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Please be aware that some guns were manufactured with a seamless transition into the bore. So accurately measuring chamber bore and place where diameter reduces is the only correct indicator.
If your cases are ejected with a wragged mouth , it's a good indicator that the case may be intruding into the end of the chamber once fired .

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