I've used both Briley and TruChoke thinwalls to good avail. TruChokes are a lot more reasonable. I too use a Bernadelli for waterfowl hunting. Mine's a Gamecock Deluxe, but instead of tubeing it I use both bismuth and Kent Matrix in it. Works great as it's choked M & F anyway. Thankfully I stocked up on when there were sales and close outs.