I’ll bet he had a reason. Could be manufacturing. Maybe it keeps the cartridge from bouncing off of the rear edge of the port etc. Ted doesn't do things for no reason usually.
I’m getting a long action and happen to like hand feeding certain rifles, especially belly rifles. This seems perfect for that.I should think the integral rail would suffice for support. Big mouth just wants fed!
I am confident that Ted knows what he’s doing regarding strength, etc. when I bought my Nucleus 1.0 and took it in for a barrel, my smith was concerned about the short barrel tenon and that I was hanging a long large profile barrel from it. He had been doing a lot of Deviance Deviant XL actions with the extra long tenons and was/is a dealer for them.
Needless to say, years later the Nuke has performed swimmingly despite his reservations.