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I would remove the action to 'slug' the barrel from receiver to muzzle with the appropriate diameter soft lead slug or ball. If the result mic's out to be round I'd shoot it and see how it patterns. Other option is to visually inspect and just shoot it.Looks like someone hit this repeatedly with a cold chisel or something. Would the force of this transfer to the rifling or affect the diameter of the bore or is it just a cosmetic issue? Ugly af. Any way to repair this or at least minimize it?
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Is it just those marks , nothing on the other side? Im trying to fathom that damage? Looks like vise marks. Pretty even spacingIt’s definitely ugly. You could run a slug down from the chamber and feel for a difference in drag. The 45/70 shoots soft lead so a slight deformation would likely not be unsafe but would definitely effect accuracy. If this is new to you you should also check the chamber area as someone may have damaged the end of the barrel to mark it as unsafe to shoot. I have an early demilled 1888 that they demilled by hitting the chamber with a torch. It doesn’t necessarily prevent you from loading a live cartridge but will dis assemble the receiver and stock pretty good.
Perfect example of why I will NEVER buy anything of Gun-stroker no matter how enticingly cheap.