Curt ....have had good results keeping the leading down in the Colrain turkey choke by using a pillow ticking shot cup.
These are cut to size and formed while loading using a wood dowel.
These ticking cups are supported underneath using a wool wad.
The choke restriction is long enough to hold the wads and shot cup without falling into the .62 cal bore.
while loading it's powder -wool wad-ticking patch lubed-shot-over shot card.
Here's a picture of some recovered ticking shot cups while experimenting on wad size.
These ticking patch shot cups were cut for no over lap on side seams.
Just another option if your anal like me about smooth bore condition .
The darker patches had less lube on them
here's the load column..plastic cup to measure shot volume only.
These turkey choke barrels are a nice transition from using a cf shotgun...