Sometimes you just end up on the raw end of the deal. I've been there too.
I had a semi-custom rifle
built by a well known smith who built many accurate rifles and had a good reputation on "the boards". He went out of business a few years ago in a bit of controversy.
In short - The rifle would only eject loads that were assembled on virgin brass. I was using Rem brass at the time. After the initial load, the case had to be tapped out with a cleaning rod. The smith blamed the brass and encouraged me to try other makes of 300 RUM brass. I eventually used 2 different mfg brass and had the same results. The smith insisted that it was the brass or "perhaps" the dies. I was using Redding Comp dies but bought a Foster Comp die just in case his guess was correct. It wasn't. The smith resisted my inclination to just return the rifle to him, insisting that it was something other than his work. After a year of trying everything imaginable, I gave up.
Eventually, I brought the rifle to an area riflesmith who repositioned the bolt handle to maximize the camming effect but that didn't resolve the problem either. Borescoping the barrel revealed nothing. I took a chance and asked the smith to set the barrel back and rechamber the barrel. FINALLY - the problem was completely resolved. Whatever the issue was, it was eliminated with a simple rechambering. Naturally, I had to pay for the smith's time and work to resolve a problem that was clearly the responsibility of the original smith who built the rifle. When I called him to advise what was determined and what it cost to fix his original work, I did not receive a very professional response and no offer to make good on anything. He insisted that I should not have brought it to anyone else and that any warranty that I had was now gone.