horse killer,
It may be that the chamber was cut a little tight and he left it slightly loose in order to achieve proper headspace and avoid having to go back and lengthen the chamber.
It may have also been a matter of timing, either flutes or the brake and he chose to make the adjustment in the wrong part of the assembly.
Take the rifle back to your gunsmith and have him tighten it properly. Then check the headspace to be sure it is to the spec you require. Adjust the headspace if needed and time the brake.
This may have been an oversight on the part of the gunsmith. But this is the type of oversight that is not acceptable since it could lead to another problem later on. Every firearm needs to be checked thoroughly before it leaves the shop.
Face it... Smith's are far from ISO 9000 certification and some don't really pay attention to be what the heck they are doing.
Nor are we paid to have the ISO 9000 or 9002 certifications. This would put the cost of gunsmithing way over the top of what most folks are willing to spend. I came from the Aircraft and Aerospace side and I can't come close to charging what I made in that industry even with a degree and 25 years experience. But I certainly enjoy what I do now.
I will admit that there might some gunsmiths with less than stellar abilities, but there aren't any guidelines or certifications other than a degree or certificate of completion from a community college program. What's worse is those atrocious online degree mills which charge you up the butt and provide you with no skills! Yet you get a diploma and certificate stating that you are indeed a gunsmith by their qualifications. Anyone can apply for the proper FFL to run a gunsmith shop. They don't have to prove anything or show a diploma.
Yes, it's a pain in the butt to search out and research who is best qualified to build for you but until there is a change in the regulation of the trade, this what you must do.
There is also the distinct possibility that this is a simple error by oversight and your gunsmith will be duly chastised just by seeing what he forgot to check. Yes, it could have been problematic but it wasn't and in most cases just seeing the problem puts the fear of God into a Man's soul for what may have happened. Judge him by his actions and his desire to fix the problem and not by internet opinions.
Regards.