I am wanting to re barrel my .243 A Bolt as well from a 10 twist pencil barrel to an 8 or 9.25 twist medium varmint type contour. I have heard some gunsmiths won't touch them because they have trouble stripping the threads. If you find someone that will please let me know. Thanks
Some gunsmiths call themselves that, but are really just "kitchen table" gunsmiths who balk when a job requiring any skill or knowledge comes up. The trade mark of the kitchen 'gunsmith' is that they'll run down the gun that they lack the skill to work on.
When you run across that, it's time to keep looking for a real gunsmith. - They're out there. A real gunsmith will either do the job, or know where to send it to get it done.
You won't hear any sour grapes BS or "dog ate my homework" excuses from a real gunsmith.