The turkey will never know the diff
.....Amen to that. Just shoot at some paper with it first to see how well it throws a pattern.
The 18 inch barrel was a cut off and its probably cylinder bore. I would have to invest in threading it for choke tubes before I run that test.
I wanted to see if there is a technical reason for not seeing turkey barrels below 22" in terms of velocity before investing in that experiment.