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austinrealtor wrote:Will firing any kind of shotshell (either these little CCI pistol cartridge shot shells, or firing a .410 down the barrel of a Taurus Judge) harm the rifling of a pistol in any way? What about firing 12-gauge buckshot or birdshot down a rifled shotgun barrel?

Just something I'd never before thought to ask.

Harm, no. You may, over time, build up lead deposits in the rifling that will need to be removed. Lewis makes a lead remover that uses a disc on a cleaning rod for handguns. Also, the "Chore Boy" scrubbers that are sold in your grocery store can be used on a cleaning rod. I recommend buying the brass over the stainless steel scrubbers.

surprise_I'm_armed wrote:austinrealtor:
I don't really know the answer to your question.
But my understanding is that pistols and rifles have "rifling" in their barrels,
while shotgun barrels are smooth.

It does make me wonder how a Taurus Judge handles both .45 and .410's.

SIA

You see, without rifling, you have what amounts to a short barreled shotgun SBS or maybe BATFE regards it as an AOW. Anyway, without rifling it is big time illegal. Decades ago, when Thompson Center first offered a .410/.45 Colt barrel for their Contender, it was smoothbore. The Feds required them to add rifling and so any firearm that uses an actual shotgun shell must have a rifled barrel.

I know of no official ruling considering the specialty shot cartridges as shotgun rounds.