Personally, I've fire-lapped a couple of guns, and lapped the lugs on a few as well. I've not had fire-lapping improve accuracy, but I have had it reduce fouling. However, Ultra Bore Coat (called UBC on many sites) did as much or more to reduce fouling as anything else I've tried.
The CZ whose lugs I lapped saw significant improvement in group size afterwards. The smaller lug was essentially not even touching the receiver!
As for lug lapping your Savages, there are a couple of things to be aware of. First, the second set of 'lugs' (which don't actually bear any firing force, they just re-direct gas away from the shooter in the event of a cartridge failure) can easily smudge or wipe off your markings when you're trying to determine whether your lugs are bearing equally on the receiver. This can fool you into thinking you have a different level of lug-receiver contact that you really have. Second, Savage/Stevens rifles use a floating bolt head, so it can rock/tilt slightly off-axis from the bolt body. Thus, if something's not quite entirely square between the bolt body and the receiver/barrel, the bolt head will tilt and still give you even lock-up. Theoretically, then, it wouldn't ever be necessary to lap Savage or Stevens bolt lugs.
The CZ whose lugs I lapped saw significant improvement in group size afterwards. The smaller lug was essentially not even touching the receiver!
As for lug lapping your Savages, there are a couple of things to be aware of. First, the second set of 'lugs' (which don't actually bear any firing force, they just re-direct gas away from the shooter in the event of a cartridge failure) can easily smudge or wipe off your markings when you're trying to determine whether your lugs are bearing equally on the receiver. This can fool you into thinking you have a different level of lug-receiver contact that you really have. Second, Savage/Stevens rifles use a floating bolt head, so it can rock/tilt slightly off-axis from the bolt body. Thus, if something's not quite entirely square between the bolt body and the receiver/barrel, the bolt head will tilt and still give you even lock-up. Theoretically, then, it wouldn't ever be necessary to lap Savage or Stevens bolt lugs.
