Still, it's his gun and if he is good with loading all his ammunition short, no problem. Maybe not the situation here, but not being able to take ammunition loaded to something like 1.150". There have been instances where guns left the factory lacking any throating. Thus, it seems odd to produce a gun that will not accept factory ammunition (assuming it will not accept factory ammunition). Whether or not the gunmakers follow it, I can't say, but I expect more do than don't. There is a specification for the chamber dimensions for test barrels. I don't tend to think this gun is one of them. And there are some guns that are made with a particular ammunition in mind, or restrictions because of the magazine (usually). I agree that it is an ammunition specification. If a 2" group at 25 yards is good enough for her, have it throated also. If your wife is shooting the P210 in something that requires bullseye accuracy, develop a load specifically for it and leave it alone. I would get the 1.114" CZ throated so the same, longer OAL could be used in both. If you don't have any feeding issues, you can decide what to do. The chamber was not lengthened in the process. The reaming was done by a competent gunsmith, using a lathe and a Clymer reamer. That's okay, because I built the gun for competitions other than bullseye. Now everything fits and works, but bullseye accuracy suffered a little. I wanted to use the same OAL as my other bullseye gun, plus I wanted to be able to shoot TC bullets at 'normal' OAL. I had to change the OAL of my bullseye load to accommodate. The chamber is exactly the right length, but the leade was very, very short. I built a 1911 pistol using a Barsto barrel (45). Bullseye shooters want the bullet (usually lead) to be just touching the lands when chambered. Sig's P210 is known for its accuracy, so I wouldn't do anything to possibly screw that up. It's up to him to determine his max OAL with every bullet he loads and make sure he stays below that max.į, if you are really worried about it, call Sig and ask them. There are many bullets that won't load anywhere near 1.169 in any 9mm pistol. In terms of how long you can load a cartridge, the max OAL varies dramatically based on bullet profile, and it varies a little based on gun manufacturer. The magazines of 9mm pistols are designed to accept cartridges of max OAL of 1.169 (with 9mm 1911/2011 pistols being the exception). The standard you are referencing for 9mm Luger sets a MAXIMUM of 1.169 for the cartridge, and that plays out in the magazine. There is no "industry" standard that says guns should be able to accept whatever bullet to an OAL of 1.169. Reaming (which includes re-cutting the throat) is changing the chamber, so the resultant accuracy is, as above, not known until you test. This may not be enough to worry about, but until you test it, no one knows. If you want to be able to use the same ammunition in any of the guns, then it will need to be loaded to the shortest, suffering whatever accuracy loss in the others. This suggests the chamber is not throated as it should be, If so, the manufacturer should be willing to re-do the chamber. If it will not, they should fix it so that it will.Ī TC bullet should not be as picky on the OAL unless the shoulder area is contacting the rifling. They should be making a gun that will chamber any factory ammunition. Have you shot it with a variety of factory ammunition?Ĭontact the manufacturer of the gun and see what they have to say. Your short chamber seems to indicate it world not accept factory ammunition that is on the longer side. Industry standards allow 9mm Luger to be as long as 1.169".
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