Ok, so i got my hands on a well used 30-06 from a friend who's had it forever and has no idea what it is either. He's thinking it's a Winchester, but the bolt looks kinda Mauser if you ask me. There are no markings on the receiver except for a 5-digit serial number. The barrel is stamped "30-06 CAL." and there's a faint stamping on the top of the barrel just forward of the receiver that looks like an oval with maybe two letters inside. The whole left side is worn away, but the right side looks like the lower-case "b". Here's some pics to help you out. If you would like to see other pics, let me know and I can snap a few more.