With the current difficulties in getting ammo & reloading components I would be interested in comments of shooters with experience using brass catchers. What is the best kind for A3 style flat top etc.? How many rounds do they hold on average? FTE problems? Use in the field (still hunting), or only good at the range? Have you used one? Where did you get it? What would be a good improvment? What to watch out for? Thanks for your input in advance.