Why lengthen the chambers if you can shoot 2 3/4" low pressure shells out of a 2 1/2" chamber? Per these two threads and Sherman Bell's articles, there is not that much pressure increase.

https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=34376
http://www.16ga.com/forum/viewtopic.php?t=1983

On the other hand, an acquaintance who was close to the late Cyril Adams had this happen to him after he lengthened chambers from 2 1/2" to 2 3/4".

[Linked Image from i.imgur.com]

He had this to say: "I bought the gun for me as it is a non rebounder. I did not have it proofed because I never intended to sell it. When it arrived I observed that the chambers were very thin compared to most. I recut the chambers to 2 3/4. I only shot light 28g shells through it and it performed flawlessly for over 500 rounds. I was preparing for the Adam’s cup and could only find 1145fps 32g loads. It let loose after the 15th one."

Last edited by Argo44; 09/19/22 07:57 PM.
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