the chamber in the store bought/over the counter rifle has a chamber that was built for factory ammo without the tolerance. The case when chambered hits at the belt and the shoulder at the same time.
That's amazing. I never knew factory rifles chambered for belted cases made their ammo so well matched to all those chambers that when chambered, both the belt and shoulder contacted those places in the chamber at the same time.
Kudos and other accolades to the companies for keeping their chamber and ammo tolerances in those areas to well under .001".
Now I'm wondering if all company's ammo would fit all other company's chambers the same way. If so, more amazing.