Spec I looked up said 16 TPI, either way each thread gives a good amount of setback so unless he’s REALLY burned the throat out it should be doable.
IIRC, the 788 barrel threads are 20 TPI and the barrel shank diameter is only slightly smaller than the small shank Savage 110 series, 1.000" for the Remington 788 and 1.055" for the small shank Savage 110 series. I have heard of people installing reworked Savage barrels on Remington 788 actions, but I don't recall having seen this conversion and I don't know how they installed a recoil lug.
