I have been loading 357 SHOTSHELLS with some success and have learned doing it. I tried paper wads on both ends, the top with melted wax and a crimp, but they wouldn't hold when firing. I tried to use 38 cal. gas checks, but couldn't get the to seat straight, so I turned a fixture that replaces the insert in a LEE expander die (photo). Steps I use below.
SIZE AND DEPRIME
CHAMPHER INSIDE MOUTH-use a 22 degree
CLEAN POCKETS
PRIME-LOAD POWDER
CUT BEER BOX WADS-cut with a 357 sharpened case
PUSH IN WADS TIGHT
FILL WITH 9 SHOT TO THE TOP
PLACE THE GAS CHECK AND SEAT
SLIGHT CRIMP
These don't move with 4.8 of W-231.
SIZE AND DEPRIME
CHAMPHER INSIDE MOUTH-use a 22 degree
CLEAN POCKETS
PRIME-LOAD POWDER
CUT BEER BOX WADS-cut with a 357 sharpened case
PUSH IN WADS TIGHT
FILL WITH 9 SHOT TO THE TOP
PLACE THE GAS CHECK AND SEAT
SLIGHT CRIMP
These don't move with 4.8 of W-231.
