Chamber Length Buttons

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We now offer our own line of Chamber Length Buttons to check your “trim to” length with.
http://noebulletmolds.com/NV/index.php?cPath=90

To Use start with a sized, de-primed cases from the rifle you would like to check. Trim the case back by about .10” This will let the button clear the mouth of the case.

Start the button in to the case mouth, small end first, just like seating a bullet. Close the bolt on the dummy case and the button will be pushed into the case neck. The resulting measurement from nose of the button to the base of the rim will be your chamber length. If you cant close the bolt, trim the case neck back, shorten it a little, and try again. Keep trimming and trying to close the bolt until you achieve a perfect fit.

The following is from “Handloader” Number 140 July-August 1989
“Know Your Chamber Length” Roger Stowers

“Chamber lengths can affect many facets of handloading. Neck tension of the loaded round and case capacity are items to be considered. Accuracy may be improved by letting the case neck stretch, and more contact between bullet and case neck may enhance the concentricity of the loaded round.
How far we let the case stretch depends on chamber length. We need to know the chamber length for the same reason we need to know the throat length – if the case length or overall loaded length allows the case mouth, bullet ogive or both, to touch the end of the chamber or lands, respectively – you can expect a rise in pressure.”

“Case length should be checked after every resizing. Remember that for all the chamber measurements in any given caliber, the largest variation will probably be the length of the chamber. you should know your chamber length as well as you know every other part of your rifle.
Trim cases when necessary, but only when necessary.”

 
Bullet maker, maker
Al Nelson

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