2 1/2 shot shells

pointandshoot

CGN Regular
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richmond, bc
Please take it easy on me fellas, I've never dabbled in shot shell reloading (only rifle and pistol cartridges). I've been interested in getting an English SxS but notice that a lot of them are nitro proofed to 3 ton per square inch and chambered for 2 1/2. I'm not overly interested in getting setup for reloading shot shells and was wondering if I could simply take some of my 2 3/4 #8 target loads and cut them down to 2 1/2, place a shot card and roll crimp them or would they probably be too hot for the gun? I doubt I'll be running a ton through it so low productivity numbers shouldn't be an issue. Short of that I suppose I'll be limited to what I can buy off the shelf. I appreciate any help, thanks!
 
Please take it easy on me fellas, I've never dabbled in shot shell reloading (only rifle and pistol cartridges). I've been interested in getting an English SxS but notice that a lot of them are nitro proofed to 3 ton per square inch and chambered for 2 1/2. I'm not overly interested in getting setup for reloading shot shells and was wondering if I could simply take some of my 2 3/4 #8 target loads and cut them down to 2 1/2, place a shot card and roll crimp them or would they probably be too hot for the gun? I doubt I'll be running a ton through it so low productivity numbers shouldn't be an issue. Short of that I suppose I'll be limited to what I can buy off the shelf. I appreciate any help, thanks!

You say you haven't reloaded shotshells so I assume that you want to know about the possibility of cutting down factory target loads. Consider this...
Your gun was proofed at 3 long tons per square inch, approximately 6600 pounds per square inch, this is the maximum load that this gun was considered safe for when new. What alterations to the barrels have taken place since then, maybe 100 years or more?
Modern target loads, although modest in velocity and payload are frequently not low pressure, 10,000-12,000 psi being quite common to reliably cycle all types of autoloaders.
To cut down and recrimp your existing 2 3/4" shells you will need to open the crimp, pour the shot out, remove the wad ( the powder will follow), shorten the hull, pour the powder back in, oops, now the wad is too long - trim the wad, pour the shot back in, then add an overshot card and roll crimp. This will shorten your shell to fit the chamber but it won't lower the pressure. And you will now have one complete cartridge. That's a lot of fiddly work for one cartridge, how much effort do you want to put into a couple of boxes of ammo?
For hunting purposes ( unless you have much better hunting than I do) and a couple of trips to the range per year factory ammo makes much mores sense. Prophet River Firearms and Ellwood Epps, both CGN sponsors carry a variety of 2 1/2" ammo made for your gun, assuming it's nitro proofed. In addition, Kent Cartridge is ( or was) the Canadian distributor for British made Gamebore ammo and any store ( except Cabelas) that sells Kent ammo should be happy to order some by the flat.
Get a good gun, feed it the ammo it was intended to use and you'll be hooked.
 
As Ashcroft says, the proof standard for 2 1/2 inch guns in England was not up to the pressure levels of US manufactured shells, under SAAMI standards. There are US manufacturers who produce low pressure shells, specifically for the vintage gun shooter. RST and Polywad are the two that immediately come to mind.
European 2 1/2 inch cartridges are manufactured to pressures to accommodate these old proof standards, under CIP rules. The issue of proof standards and cartridges for vintage guns has been discussed endlessly on the Doublegunshop BBS and Shotgun World forum. You could write an entire book on historic vs. modern proof standards, and still not get complete agreement among experts. Wise people err on the side of caution with vintage guns.
Gamebore is one of many British Manufacturers that produce cartridges for 2 1/2 inch guns.
Add Tradeex to your list of site sponsors that stock 2 1/2 inch ammunition.
 
Thanks guys, appreciate the leads and info! I haven't bought anything yet so year and condition are still a variable. I was just trying to figure how difficult it would be to track down or make 2 1/2 shells first and the internet is full of comments all the way from "you can shoot 2 3/4 as long as the hull is plastic" to "just cut the crimp and put a shot card ontop". A few posts on shotgun world suggest that 3 tons per square inch equals roughly 8900psi (I don't understand the science behind it and maybe this is incorrect also), but regardless of the number it is lower than what a 2 3/4 field/target load can produce. At this point if I do end picking one up I'll just grab a 250ct of 2 1/2 and save the hulls incase down the road I get into reloading shot. Now comes the fun of deciphering all these old Britsh proof housing marks, if nothing else I'm getting a crash course in these old British doubles.
 
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