I know that there are grooved 219s in .22 Hornet, but in .30-30? Those grooves are pretty puny gripping areas, and I wonder how well they would hold a scope against .30-30 recoil? Some guys have had 24s with grooved .22 barrels that wouldn't hold a scope against the 20 guage bottom barrel's recoil, especially with slugs.

I'd go with a receiver side mount or scope blocks on the barrel, but you might ask the gunsmith at Ahlman's in Minnesota; they mill scope grooves in .22 receivers and probably know what they will hold.