In all probability, the barrel got a dimple in the flat crown at some point in time. It happens more frequently than you might think. I repaired an octagon barrel with a flat crown about 2 years ago. Although I did it on a lathe, the old timers did it with a brass ball and some compound.
As far as the chamber being relined, that has never happened to this rifle. Jeff can check it by cleaning the extractor cut with a toothpick and some alcohol and giving it a good visual with a stong light and a magnifying glass.
Let's give this a try.
You boys should never say never say never say never, ever. Is it jealousy that drives you guys attitude, or what ??
Now the big question I have: when was the last 1895 assembled by Marlin ? And what date did Savage fire up their plant and start producing rifles ? Did Marlin just pitch the extra receivers and barrels they had out the window, or did they send them along to Savage ??