Tumbling - What Media???

[sheepherder]

Originally Posted by DavidJayUden

I'm no machinist, but I suspect that a high degree of polish is not part of reaming a chamber.

It is, for the reason you mentioned - The brass expands on firing. You don't want it 'sticking' when you're trying to extract it. I have used emery cloth to polish up a chamber on occasion, but the reamers I use leave a nice smooth surface finish [Clymer reamers].

I know the 'sticking' you're talking about on some bolt action rifles - I've seen an extractor pull chunks out of rims because the case 'stuck'. But it was a rough chamber, not a smooth cartridge...

I don't believe that a 'lubed' case is hard on actions. If it was, Winchester/Remington/etc wouldn't offer nickel plated cartridges...