In the random sampling I've seen of JES rebores (three rifles), the bores were pretty ruff. They shot on the poor side of factory accuracy, and cleaning them was constant, crucial, and tedious, but that was only an issue during load development. I bought all three used, not from JES, so maybe that's why they were less than stellar examples.
While my 99E JES rebored bore is not as pretty as factory barrels, it shoots 1.5 MOA consistently after finding several loads that work.
Dyna Tek Bore Coat solved the issue of copper fouling.
