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well was really bored today took my revolver out. put 2 cylinders through of federal champion 38 special 158 LRN. first half inch of barrel, roughly a Kleenex thick layer of lead deposit..
chore boy on a bore brush is barely touching it..
anyone ever counter bored a revolver from the forcing cone
No...there's a proper tool for that. Brownells offers it, have a look. I've cleaned them up a bit after some years of them spitting. It's because they're a bit out of tune(alignment).
out of alignment would put it as having the lead to one side, etc. Its PERFECTLY centered on the forcing cone/end of rifling on the gun. Wrap a patch on a brush and its easy to feel the constriction in that spot.
How hard would it be to pull the barrel and have someone simply relieve the constriction by running a cutting tool through to remove metal and "restore" the rifling profile so when reinstalled there is no constriction
Have you tried lapping it? May just need a little polishing.
If your dead set on reaming it why not use a pull thru?
Well, pulling the barrel really isn't hard if you have the tools. Can't say for a layman though, don't know what you have access to. Perfectly centered means you have a bit more "Gap" than needed and it's just a spray. Still you might decrease it a bit if you give the cone a bit more angle. The alignment can also just give a touch of shave on one side to make it spit but yes, there's indication of that.
What is it? Model 10 or M&P?
Might be that the cleaned bore at that point is actually too large, rather than too small, allowing blow by. Perhaps this is what you mean. Are you thinking of setting the barrel back, and re-cutting the forcing cone? Sorry if I'm off base here, just asking.
Set back could be done too, just one turn. Then carefully take the back end off until you have clearance...I'd have to open a book to find out how far cylinder gap needs... Again a lathe is required, although there ARE hand tools available.
Lewis Lead Remover...Lee has/had a similiar item for cleaning revolver bores and chambers.
As far as leading in revolvers...depends on the gun and the ammo. I own revolvers that stay free of lead and one or two that seem to gather some from the forcing cone forward. I have bought ammunition that seem designed to lead barrels too! A bulk box of .22 LR Winchester lead hollowpoints from a few years back was just horrible. It's possible you got some ammo from a bad batch(no lube or soft or under-size bullets).
A lot of lead bullet shooting will inevitably leave some lead in a revolver bore. I've been known to shoot some jacketed ammo after shooting a bunch of lead bullets. A nice smooth well seasoned bore seem immune to leading-up.