Slickrick - Your best bet is to find a shooter at the club that has a custom rifle and talk to them. A Benchrest or competition guy. Someone who is serious about his craft.
I am betting they will be able to tell you two or three in the surrounding area, as well as any that they did business with and were not happy with the outcome.
As you are in Philly, I am betting it's not a very long list, gun regs and all.
But Pennsylvania is home to the original 1,000 yard Benchrest Shooting Club and those guys take their sport to a whole different level of "passion".
I am betting you can call or write the club, maybe through their website, and get a list of guys who can help you with this exact issue.
Best of luck!