I now have the gun but have no shells to test yet.

In theory the lower edge of the "flat" boltface would allow straightforward advance of the cartridge upward into position on the boltface as it is moved forward.

My concern is whether there is adequate restriction/hull control to prevent the rise of rear of the cartridge ABOVE the boltface when the cartridge is being moved forward transitioning the rails hull contact points at speed.Perhaps the front of the cartridge is already entering the barrel chamber. We'll see--