L B Jefferies

Baldie did the conversion for me. Yes, the hinge now folds the other way and "captures" the bolt knob. Makes more sense than folding the other way. The only issue that I've had is that the cheek piece, even on its lowest setting, is higher than the AT original. I've had to change from medium mounts to either high or very high to be able to see through the scope. With the benefit of hindsight, I might have been better buying an AX instead, but I like the look of the AT. Hope this helps

Can you borrow a set of go/ no go gauges?

Good question. Makes me wonder if it's a problem with the brass and/ or the sizing process rather than the rifle. Could the neck and shoulder have stuck in the die and been pulled forward making the case too long? I can't see mention of factory ammunition being tried. Edit I see there is mention of Winchester ammo.