The 220 #1V Swift has always been listed since cataloged, as 26."
I don't know of any non cataloged Swifts so it's highly unlikely there are
any factory with shorter barrels.
I know that I recently mis spoke and posted 24" for the Swift but I'm old a forgetful and wrong.
As a overbore cartridge the Swift works best with heavy charges of slow burning powder, hence a longer barrel.
RWT