Given the (relatively) low pressures of shotgun shells, combined with the construction of a shotgun shell, I would rather doubt there's much danger. I've seen people shoot slugs out of (fixed) full-choke bores with no ill effects to the gun (their shoulder was another matter!); the plastic of the shell is softer and more malleable than even lead, and it's wrapped around shot, instead of a slug, allowing the whole thing to compress more easily than one might think.Beiruty wrote:It is a dangerous somehow, the barrel has less diameter than the shell.What if someone had a very restricting choke, he might have a bad day.
Where I would doubt the wisdom of firing cut shells is through an adjustable or replaceable full or turkey choke. I still doubt it would damage the firearm, but you might damage the choke, or "involuntarily remove" it altogether.
I wouldn't expect terribly much accuracy with a cut shell, but if that's all you have, then it's what you have.