m1903a1 tryout results

[browningautorifle]

I suppose I should just rent a pull through reamer and lightly "chase" the chamber?

I'd stay away with reamers, try a paper polish first. Use a mandrel made of wood dowel with a slot cut for machine paper with oil on it. Try turning it with a low speed drill and in and out. That should remove any offending chatter marks. It doesn't take much.