Questions about an unmarked .260 barrel

[privateer]

With the markings above the threads, it sounds like a Savage barrel. The barrels are marked with a caliber code of a letter , or sometimes 2 letters to designate caliber in production. The model and caliber is later roll stamped after the barrel has been proof tested.
This barrel most probably came from Steve Simons, a Savage parts dealer from Florida who is now out of business. He acquired a number of .260 barrels from the factory when they discontinued that caliber back in 2003. None of these barrels were installed at the factory, they were meant for replacement.

Thanks sharpshooter! Any idea what the twist would be?