To my knowlege, Magtech doesn't make hulls for 10 gauge, been hoping they did for the past few years. Unless you can find some old stock of Alcans or antique 10's, Track of the Wolf or Rocky Mountain is the place to get new brass.

Jack Kuzepski

I stand corrected on brass 10 gauge shells. They are available
At Track of the Wolf. I believe they make them in house. Very
Nice cases with Parker markings on base. They are not cheap,
But much better quality than tho old Alcans.