What is the clearance between that rod's bushing and the bore? What is the clearance between that rod and the bushing? What is the distance between the bushing end of the rod and the DTI? How straight is the rod? When was the straightness of the rod last checked? Is the absolute end of the bore dead nuts perpendicular to the tapered rod? Is the bullet more influenced by the bore or the grooves of the barrel? Is the rod bushing on the bore or the grooves of the barrel?
I'm not bagging on the video you linked, but realize there are flaws in EVERY barrel fitting technique. One thing I am certain of, a deer will be just as dead if it was shot from a rifle chambered in the method in the video the OP posted or in the video you posted.
Yes you would be correct, HOWEVER, I am willing to bet that if a machinist is going after runout that is well below .001, that they are going to address all of the issues that you mentioned above to the best of their abilities. On the other hand, if you are happy with a cheap single .001 indicator running on the outside of the barrel, then I am willing to bet that your standards are not exactly the same.
THE DEVIL IS IN THE DETAILS, as you pointed out with a very long list of them!
I could probably chamber a rifle barrel in my garage that I could kill a deer with, and I have no professional level of equipment or training. That being the case, I am not going to be touting myself as a "certified master gunsmith", and I am not going to be making videos and posting them on Youtube.
When uneducated/inexperienced/new shooters see someone calling themselves a "certified master gunsmith", then many of them will assume that person has to be 100% legit, and they are going to build them the best possible rifle a gunsmith can make.
Per many comments above, and not only about the chambering video, but other videos he posted on Youtube, this gunsmith is not working at the highest possible levels, and I am pretty sure that many gunsmiths/machinist would not call what he is doing "master level" anything.
I am not about "bashing this builder", I am about trying to educate shooters on investigating/understanding who is building their rifle, and figuring out what the actual qualifications, capabilities, and results will be for any gunsmith that they might consider using?
Sorry, but I am NOT going to pay a Gunsmith to build me a "Minute of Deer" rifle, I am going to pay them to build a rifle to the highest possible standards (taking into consideration the build materials they start with). If I am happy with a "Minute of Deer" rifle, then I am just going to go grab a factory rifle off the shelf.
Per my first post, "Different Strokes for Different Folks".
I would second the comment about getting some of the best builders in the industry together to do a video for new shooters so they would be well educated when it comes to having a custom rifle built. Just look at the debacle that happened with Tactical Rifles!