To get off the personal attacks & back to the .410; re-reloading. While true the savings for reloading vs factory are probably higher in loading a .410 than any other size, with possible exception the 28ga. However if reloading then a 20ga shooter can load 3/4oz loads. Loading a case of 500 shells with 3/4oz one will have approx 1½ lb of shot left from a 25lb bag. Loading the 11/16 oz for the 3" .410 you would have approx 3.5lbs left or 2lb difference. Even at todys lead prices this is not much. As to the .410 taking lighter powder charges I looked at two popular powders for the .410 (Hodgdon's & Alliants) & both used 14½-15 grains. Powders from the same two manf's for loading a 3/4oz 20 ga came in @ 12-12½ grains, plus they were powders which had wide useage in other gauges as well. The powders suitable for the .410 are usable only for magnum type pistol loads or small capacity rifle loads, such as the .22 Hornet. The 20ga loads much easier, cases "Generally" are known to give longer life, components are much more readily available, unless you want the ½oz skeet load. The ½ oz load is truly the only one in the .410 which will save you money loading & even it won't if shooting factory.
Again, let me itterate, I have absolutely no quarrell with anyone who desires to shoot one of them, just feel they need to understand they "Are" paying more for less. Personally, I prefer to pay less for more.
