If you read all the posts, you will find he has not inlet the lock as of yet, which is what he should have done First... Also it is a straight barrel & straight tang & he can move the barrel back where he wants it, thus obtaining proper vent liner position.
V notching the breechplug just builds in a problem. Yes, it will get the rifle shooting & is done frequently, but also has it's disadvantages. It is a fouling trap, a rust trap cause you can't clean it easily, it breaks the breechplug/barrel seat, and to me should be avoided if at all possible. Others see it differently & that is fine. But why have it if you can just move the barrel back a bit & eliminate these issues ?
Keith Lisle