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Never know when your serious..so im afrais to answer by makin myself look like an idiot if you just bustin..lol
 

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It can take all sizes not exceeding that number because it headspaces on the rim.
 

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LOL, I'm serious. Just bought an expensive shottie chambered in 3" and it dawned on me I might not be able to shoot 2 3/4", lol...

My other shot guns can handle either one.
you see what happens with the boy and the wolf?? Lol!

but anyhoo..yes if its chambered at 3" you can put anything 3" and down in it..obviously nit larger than 3"
 

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Nope. U ****ed up. Lost your money. That will teach you! Lol.

Now, depending on what you got i can help.....,i will give i $.25 on the $1 for it.....this way u r not loosing "big"

bwah ha ha ha!

some one please ban the OP! :)
 

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It can take all sizes not exceeding that number because it headspaces on the rim.
You are correct that you can always go shorter but cannot go longer--- but it has absolutely nothing to do with headspace-- it has to do with the location of the forcing cones. A longer shell with often chamber and allow the gun to close, but won't be able to open up fuly when fired, and can cause excessive pressure (up to and including blowing the chamber).
 

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You guys let him off the hook too easy.. I woulda told cg he was screwed..... .. then let him off the hook. ;)
 

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A few years ago on one of them real life emergency TV shows there were two younger teens shooting a double barreled shotgun that had 2 3/4" chamber, they had a box of Mix & Match Ammo that they were shooting. They put a 3" shell in the right barrel and shot it. It blew out the right side of the barrel and the shot killed the kid that was on the right side of the gun. It does happen, like posted in one of these post a 2 3/4" chamber will hold a 3" shell. BUT IT DOES NOT HAVE THE ROOM FOR THE LIP OF THE SHOT SHELL when fired and causes excessive preasure at that point.

I know a guy that use to ring a shotshell about 1/2 an inch from the metal and leave an 1/8 of an inch of shell on each side of the shell if you can picture that. He carried them while duck hunting so he could shoot a deer if one came close enough. It suposedly acted like a slug at short range. I sure as hell wouldn't try shooting it for safety reasons.
If I were to shot a deer during duck season I'd just carry slugs or buckshot and suffer the concenquenses if caught.
 

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Many people don't realize that shotgun shells are designated (measured) by their fired length, not the unfired length. A shell marked 3 inch from the factory will have an unfired length of roughly 2 1/2 to 2 5/8 inch. Never load a shell with an unfired length of 3 inches (as measured by a ruler) into a gun marked with a 3 inch chamber or you will get a dangerous overpressure when fired.
 

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... it has to do with the location of the forcing cones. A longer shell with often chamber and allow the gun to close, but won't be able to open up fuly when fired, and can cause excessive pressure (up to and including blowing the chamber).
No.
12ga SAAMI specs for chamber pressure is 11,500 psi for 2.75" and 3". Ejection will be the biggest issue IMO and only because the hull will be longer than the port. Sherman Bell ("Finding out for Myself" Double Gun Journal) notes a 0.25" increase in length will increase pressure about 500psi. Also note that forcing cones are typically shorter than shell length ie 2.75 may measure < 2.5" (common in older guns is 2 3/8" chamber length for a 2 3/4" proofed gun) this is to create a tight seal from case (hull) to wad to barrel.
 

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No.
12ga SAAMI specs for chamber pressure is 11,500 psi for 2.75" and 3". Ejection will be the biggest issue IMO and only because the hull will be longer than the port. Sherman Bell ("Finding out for Myself" Double Gun Journal) notes a 0.25" increase in length will increase pressure about 500psi. Also note that forcing cones are typically shorter than shell length ie 2.75 may measure < 2.5" (common in older guns is 2 3/8" chamber length for a 2 3/4" proofed gun) this is to create a tight seal from case (hull) to wad to barrel.
Ummm... NO. And fixed breech guns. Sheesh. I'm very familiar with Mr. Bell's articles. The chamber and forcing cones are NEVER EVER shorter than the shell. It would create catastrophic pressures.
 

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You are correct that you can always go shorter but cannot go longer--- but it has absolutely nothing to do with headspace-- it has to do with the location of the forcing cones. A longer shell with often chamber and allow the gun to close, but won't be able to open up fuly when fired, and can cause excessive pressure (up to and including blowing the chamber).
So if the round headspaced on the mouth or shoulder it would be alright?

No.

You may be correct about the forcing cones, but if the round didn't headspace on the rim, my statement would not be true. If you tried 2 similar rounds that headspaced on the mouth or shoulder in the same barrel, like 10MM and 40SW, you could have a catastrophic head separation.
 

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Ummm... NO. And fixed breech guns. Sheesh. I'm very familiar with Mr. Bell's articles. The chamber and forcing cones are NEVER EVER shorter than the shell. It would create catastrophic pressures.
Using 2 3/4 inch shells in short chambers has been shown to only "slightly" raise the chamber pressure. Sherman Bell, in article titled "Finding Out for Myself" Part V "Long Shells in Short Chambers" (Double Gun Journal, Winter 2001) said that with loads that are sensible in a light 2 1/2 inch gun, he saw no dangerous pressure levels produced. He said there was no reason, related to safety, to lengthen an original 2 1/2 inch chambered gun to shoot 2 3/4 shells, as long as the pressure of the 2 3/4 inch load you use is the same as the pressure of a 2 1/2 inch load.

However, recoil may be significantly increased, especially in a 20 gauge 2 1/2 inch chamber if the case mouth extends into the forcing cone, or even worse, the bore. Remember that the stocks of L.C. Smith shotguns are somewhat delicate, and a cracked stock may result from more recoil.

And yes, many American shotguns the 2.5" chambered guns measure 2 3/8" to the start of the forcing cones. This was done to compensate for poor gas seal. 2 3/4" guns often were shorter to start of cone for the same reason.

Knowing the pressure spec from SAAMI for 12 gauge is 11,500psi. knowing that tests have shown minimal pressure increase and that opening into forcing cones only increases RECOIL the big issue is ejecting the shell from a repeater.
 
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