I still have a good supply of Alliant 20/28 powder but have been experimenting with Longshot for 20-gauge for when it runs out. I've done about (600) 7/8 ounce reloads with Longshot so far; it's readily available and works well. A friend has been doing the same for 3/4 ounce in 28 gauge.
We both shot the 100 bird sporting course today. Loads straight from the Hodgdon reloading site and both of us did well against three 12g competition guns.
So, you want a somewhat lighter load for vintage SxS guns? Just use a powder bushing that’s one or two numbers lower than the one for a higher velocity published load. Of course that's after weighing the average powder drops for that load.
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