Bad extractor or bad ammo?

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Hi,
wanted to add a follow up reply after getting some good info from an experienced gunsmith I spoke to at a nearby gun show.

He advised that older gunpowder can cause corrosion in the tube, notably around the chamber where the casing sits.

And, what does corrosion do to metal?
Makes it coarse or rough (this is where the lighbulb came on for me)

So, it's not the size of the chamber or bullet casing but the roughness that causes the spent cartridge from binding up and failing to eject.

So, I'll try to find some sort of drill attachment to smooth that out a bit and see how it works.

If it works I'll post so we all know.

Cheers!
Greg in Indy