I use a 20ga TDC barrel(#FS03344) for turkey, it patterns excellent with #7 Heavyweight Flitecontrol thru a full choke, see the pattern test sticky, JonD is using one too. There's also the 20ga 26” Full #FB020 that should work great with Flitecontrol ammo, Federal recommends a full choke instead of a turkey X-full, althought the extended screw-in choke would be a better choice since it has a long straight section.
Tim