This is a sample guest message. Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
Maybe from a barrel-wear out test? To find out how many shots a barrel can have before it is becomming inaccurate because it's worn out. After all; they are proving ground scrap.
Or maybe pressure testing?
The middle one looks like most 20mm and 30mm fired shells i have,the driving band seems to slew over into the next groove.
The last one almost looks too neat!
To test another type of rifling, easier cheaper or faster to manufacture and then proving the barrel wear and precision with already manufactured ammo, that is my humble theory.
Maybe there exists some writen proof in the archives.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.