I have a Flaig's Custom Mauser in 30-06. The barrel is full taper with slide over sight. It covers the barrel proof marks and dove tail. Do you think the barrel could be identified if I removed the sight?

I have added a Leopold scope mount, scope turn down saftey, and Timey trigger, pillar mount and action bedding. I'm I hurting the value of this gun? I only want it to shoot well. It wasn't shooting good at all. The best I could do is 4" - 5" at 100yds.

Any information or advice on this gun would be appreciated.
MM879