A friend I work with told me he purchased the wrong ammo for his brother. He mistakenly ordered 12g instead of 20g. His brother wanted deer hunting 20g for a rifled bore. He showed me a pic of the ammo he purchased. It was Remington Sabot Slug ammo.
My friend told me he can’t use this ammo in his 12g because his gun’s barrel isn’t rifled and this ammo will damage his barrel. This doesn’t sound right to me. Admittedly I don’t know much about shotgun barrels and ammo types for particular barrels.
Does his claim have any validity?