square shot used to be the norm for "spreaders" don't know how available it is now but I have shot some out of a very tight choked fox with acceptable results. The wads with a "stem" in the middle of the column seem to work pretty well too. The most common explanation of tight choked doubles of years gone by is the poor quality of ammunition as compared to today. Trying to duplicate the loads of yesteryear with fiber wads and overshot cards may open patterns, but you are going to have a lot of deformed shot. perhaps the best solution is finding another gun for the collection with open chokes that you can love as much!!