I have a hard time believing this knot is strong but it is small and easy to tie and that matters.
I can believe it hasn’t been around forever but l don’t remember it.
1930 J.P. Sauer and Sohn Model 14 is my first SXS and I love it! I am curious if there is any way to tell if the chambers are 2.5” or 2.75”, other than going to a gunsmith of course. I have checked the barrel flats and nothing seems to point to a chamber length. Philip Raley
Easiest way to check you chamber is to find a socket that will just fit the chamber and put a short extension on it.Slide the socket carefully into the chamber and mark it when it stops .That will give you the chamber length .That will give you the length of a fired case, so if the chamber measure 3″ it is actually a 3″chamber .Being a Sauer and Sohn it would not surprise me if if is a 2 1/2″ gun.
David Henry Todd yep. A socket and a wrap of painters tape to get the exact shell diameter is how I did mine.
Very easy to accurately measure chambers. Take an old credit card/membership card….the plastic kind. Cut the card so it’s the exact width of the opening to the chamber. Slide the cut card into the chamber until it stops. Mark on the card where that is. Remove and measure the length the card went into the barrel…..that’s the chamber length. It’s a very accurate way of doing it without gauges.
But an error needs correction. Check and double check is the rule.
David Henry Todd you are a bit confused on the measurement of cartridge length. I think you’ll find a 2 3/4 inch cartridge is that length in its fired state so a chamber that is 2 3/4″ is for firing 2 3/4″ shells. The problem is that a 2 3/4″ star crimped shell will easily fit into a 2 1/2″ chamber and fire but the crimp opens onto the forcing cone causing greater resistance to the passage of the wad and so elevating pressures somewhat.Long story short if the chamber measures 3″ then it is by definition a 3″ chamber.
Doug Alcock not the first time I have had a hard time explaining stuff! LOLThat is what I meant, but got it backwards, the finished case is actually shorter than the fired case
Another exchange below.
I would get it checked by someone who knows how. No use to risk a good gun or your eyes. It’s not the pressure it is the length of the shell.
David Harrison Sorry David but that’s not correct. It is absolutely the pressure that is relevant. The length of the case is of minor importance.
There’s a myth that a longer case opening up into the chamber cone produces a gun-destroying pressure spike. This is not so as tests done by Sherman Bell and Tom Armbrust have proven. Also tests run by English gun writer Gough Thomas.Between 1955 and c1970 all 2-1/2″ crimped cartridges loaded by(British cartridge manufacturer) Eley-Kynoch were loaded in 2-3/4″ cases but were loaded to give correct chamber pressures for 2-1/2″ guns. Eley-Kynoch sold tens of millions of these cartridges without a problem. If there had been any issues with them you can bet the British Proof Houses would have intervened.The problem with long cases in short chambers occurs because 2-3/4″ cartridges intended for 2-3/4″ chambers are loaded to higher pressures than a 2-1/2″ gun is proved for. This problem is even greater in the US because SAAMI service pressures are much higher than British Proof House/CIP ones. No American manufactured 2-3/4″ shell should be fired in a 2-1/2″ chamber.The service pressure for a 2-1/2″ chambered 12ga under British Rules of Proof is 3 tons per square inch which translates to 8000psi. Anything under that should be fine (and with modern powders it’s possible to get substantially under that and still maintain velocity in the 1200-1300fps range).To reiterate my opening remark, it’s excessive pressure that damages guns not case length.