I also had JES rebore a bbl for me and was pleased with the results.
303 to 35-303 to save a Watson Bros Martini Sporting rifle.
Fast turnaround. I chose his 3-groove rifling and can't really kick it for any reasons related to accuracy.

I only had to send him the bbl onthat one as the HS was fine on the rifle.

As a side note, when mine was done, JES did not mark his rebore work in any way.
It is my understanding that at this time he stamps the rebore work with a not so discrete marking above the wood line right at the breech end.
Some people have stated their displeasure with that and have asked him not to or to stamp it underneath, etc. Especially on work done on collectible and classic rifles.
There are some discussions about the practice on other Rifle forums.

Maybe the practice has changed or is optional since I first heard of it.
But it may be something worth looking in to if that would negativey impact the returning work for your needs.

The only other rebore-re-rifle 'smiths I had do any such work are out of the biz or gone now.