Missing some important info here. When people reference 1/4, 1/2, 3/4, Full in 12 gauge, you can make some reasonable assumptions about how much constriction in thousand's/in they're talking about. Once you move into smaller bores all bets are off. I've run into some top line Italian makers who seem to think 1/2 is 5/10 mm, or .020" in any bore. What is the constriction of the choke tubes in the video and what are the actual constrictions of your Rottweil? His 1/4 and 1/2 may be considerably different than yours.
