It would sure be interesting to pattern some of those 3" flyer loads in a Becker bored Super, a regular HE or a model 21 Duck. I would also be most interested to know the specific consruct of those loads.
On the reasoning for today's pricing of 28 & .410's vs. yesterday's .. the day before yesterday, every gas station, general store, hardware store, farm store & bait shack had shotgun shells for sale. Yesterday still had every Seven Eleven handling shotgun shells through most of the 1960's. Today it is primarly a skeet thing; the days of the small gauge farm guns & the .410's of our youth are past. Look what a Stevens 311 in .410 is bringing! Are they being shot?
Today, the 28ga. & .410 provide the best reason & potential for quick ROI for reloading.
What more can be found out about those catalogued 3" flyer loads?