This is a barrel (chambered in 300 BO) that someone had put on a Sako L46. The only marking on the carbon steel barrel is a trademark of a hammer inside a circle (see photo). It is nicely imprinted as compared to the caliber designation stamped on the barrel by the gunsmith, so I am guessing this is the trademark of the barrel maker.
Anyone know whose mark this is?

Anyone know whose mark this is?
