Refreshing rifling with simple tools and few skills?

[Tinhorn]

Tinhorn wet lube- 25% mineral oil in water. Try it, machinists use it to cool cutters and carry away chips. I use it for patch lube. Works OK in all my barrels.

 

[Scota@4570]

If the barrel is in good condition leave it alone. Shallow rifling is good. I have made several ML rifles with barrels intended for 45-70 rifles. They shoot extremely accurately. I made one rifle with deep round bottom rifling. IT shoot very poorly. I put that barrel in the junk steel bucket and replaced it with a regular one. IT shot very well. IF I had to choose deep or shallow I choose shallow.

Hot dry weather makes fouling more difficult to manage. Try putting a slotted jag on one end of your rod and use the other to seat the ball. Use a DAMP patch to swab between shots.

Your idea to glue sandpaper to a lead lap is no good. You will not cut enough metal to be measurable, except at the muzzle, which will them be funneled.