Have never paid much attention to the rollmark. My curiosity made me open the safe only four with factory take offs in there right now. One very close maybe a smidge tightened "in". Second one on very top. Third 180 out "upside down" on right side. Fourth can't see it at all.
Grandkids have at least 5 more that have been swapped I would imagine they are just as random.
All my other savage/stevens all have aftermarket barrels with no roll mark. The ones that I chamber myself are just etched on the breech end for caliber designation. Other after market are either stamped or etched also on the breech end. Obviously you can't read those calibers without practically removing the barrel.
Someone out there probably has an ingenious way of simply remarking a barrel for those who may have trouble identifying which one it is.