The "damage" you see is of no worry. You need to shoot another 2500 rds. down the bore. Use GREASE on the rails not oil.
I'm still shooting the 155 gr. magtek HP's loaded with the old hogdon load of 10.0 of longshot, in my 40ve. Over 1350 fps and works great getting those wet logs burning on campfire weekends. HAHA
How this pistol holds up to these hot loads amazes me.