Well that cracks me up and not surprising.
If for example the 7.62 nato spec reamer is suppose to be a standard you think that would be the standard used in guns?
I’ve seen the same thing if you will in production guns (commercial) there is the saami min spec standard but that doesn’t mean a manufacturer uses that standard.
This is a good reason why whenever someone orders test barrels from us and don’t supply a print for everything and just call out 300wm or any other caliber/chamber I reference the tool part number on the drawing and put that info on the sales order confirmation copy so there is a track record of what we made the barrels to. They get all that info sent to them in the confirmation for review. That way it cannot come back on us making the barrels wrong.
I’m dealing with this headache right now with an overseas customers for finished M40 sniper rifle barrels for they’re military. The order is for two batches of 350. They’re prints don’t show enough detail when it comes to the chamber. They call it 7.62x51mm. So I’ve sent them several different prints for them to tell me which reamer to use and no one at the arsenal (can’t talk to anyone directly as is has to go thru a contractor which no one there knows anything about guns) can tell me which exact chamber spec it is!
So I’m hesitant on taking the job as they have a accuracy requirement at 200 yards the barrel has to meet. They say they are using three different types of ammo which are 308w Federal GMM with a 175gr bullet, M80 ball, and a 3rd some foreign 308 match round which escapes me right now.
So they ordered two barrels for testing. One with the 7.62 nato reamer and one with the 308w SAAMI reamer.
I’ve also asked how are they inspecting the chambers and bores so we do apples and apples for inspection. No one gets back to me. That’s why I’m hesitant on taking the job. Poor communication and I don’t want anything coming back at us.
Quite possible the folks ordering your barrels don't even know what chamber they want. Not unusual for military " mechanics" to just grab a component off the shelf and expect it to perform it's function.
Not long ago, on this forum , we had an individual order and receive a short chambered .308w barrel and couldn't understand why, once installed, it wouldn't chamber a round. He was under the impression, from reading on the internet, that short meant 1.630 and had not clue it should be 1.620 or even shorter and would require finish reaming. Way to many enthusiasts read and that's it , no comprehension of the data being used. Whatta Hobby!