I'm just wondering why multiple reload case sizes are necessary. The AT 29/40-120 case can take grains of different lengths (or two grains), but all other hardware that I know of requires a different size for each reload size group. Would it be possible to make one or two cases that can take a wide variety of reloads? For example, with 38mm motors there could be a "small" case that takes 1-3 grains and a "large" case that takes 4-6 grains. If there are not enough grains to fill the case, some kind of filler or plug could be used. Of course it would be a little heavier than individual cases, but that's a trade off for saving some money.