gofastman Wrote:If it closes on factory ammo, doesn't that negate the need for a GO gauge?
You need to re-read what I posted..No, a factory cartridge will close on a short chamber..
A go gauge is the industry or military standard (depending on which need is being used) the minimum length a chamber should be for safety and reliability reasons.
A no go gauge is a guild line, not an industry standard of the maximum length to maximize accuracy and case life.
A field gauge is the industry or military standard (depending on which need is being used) to determine if the chamber is too long for safety reasons..
For most people a go and no go is enough.. If the no go fits in a chamber it does not necessarily mean the chamber is unsafe, it means the chamber is not optimum for case life and accuracy. It would take a field gauge to see if the chamber is unsafe..Most people will reject a barrel that a no go gauge will pass for obvious reasons (case life and accuracy) as it is expected that any decent factory commercial rifle barrel should pass a go and no go..