My take is you'd want to contain the turds in the barrel with something like a big shotgun wad. If close enough in size, maybe a flimsy Dasani or Poland Spring 500ml water bottle. If bottle too loose you might need put a rag around it to seal it off from the propane charge.
Cut off the bottle neck with screw-top off so you are left with a cup. Then slice the cup all the way to the base in 4 spots at 90-degrees around the rim to create strips. Hold it together and fill up with turds then slide down into the barrel. When fired the cup strips should peel open and fall away from air resistance while the turds keep f;lying. Might need some trial and error.
My take is you'd want to contain the turds in the barrel with something like a big shotgun wad. If close enough in size, maybe a flimsy Dasani or Poland Spring 500ml water bottle. If bottle too loose you might need put a rag around it to seal it off from the propane charge.
Cut off the bottle neck with screw-top off so you are left with a cup. Then slice the cup all the way to the base in 4 spots at 90-degrees around the rim to create strips. Hold it together and fill up with turds then slide down into the barrel. When fired the cup strips should peel open and fall away from air resistance while the turds keep f;lying. Might need some trial and error.
Shotgun wad -
https://www.brownells.com/userdocs/products/p_100008823_2.jpg