Fire lapping a 303?

[RJW NZ]

My brain cells finally lined themselves up correctly and I remember what I was going to ask about the surfaces found inside enfield barrels; we're pretty used to seeing the overall look under the microscope in multigroove barrels, I've got a near new Savage no 4 with a 2 shiny groove. They always seem to have a lovely polish on those wide wide surfaces but any idea what they are actually like under a microscope? Maybe their reputation being decent shooters comes back to a smoother machining in there? Really interested in your thoughts on this one?

[bearhunter]

I haven't done any 303 bbls but I have done a few 22rf bbls and one 308 bbl that had nitrated leades. Both 22rf barrels, benefited from the process and the 308 bbl, showed no difference in accuracy at all. It was finally set back about an inch and rechambered. That really had an effect. All bbls, were match bbls, with tight spec chambers. I will say, on the 22rf barrels, there wasn't any noticeable wear or marks, both had less than 200 rounds down the pipe. The 308 bore was from a bench rest rifle and had 1500 rounds through the bore. It became a hunting rifle barrel, after recontouring and chamgering. Shows very little if any wear and is very accurate. The leades were badly worn and were the culprits in this case. For all I know, the lapping, may have helped the rest of the bore. I do know, that I haven't done it since and that was about 10 years ago. I have another 22rf that may get the treatment, if nothing else works.

[m4carbine]

Savage did 2 things that no one else did:

1. They straightened their barrels, still do, others did this too.

2. They lapped the barrels with an automated lapping machine, this is unique to Savage in that era.

[RJW NZ]

Would both of those apply to all ww2 era savages, two and multi grooves? There's certainly some fine shooters in savage enfields, especially early ww2 ones.