A good question. I have always used smokless powder for all of my reloads. I have read the Sherman Bell articles in DGJ. I use low pressure powders and generally tend to load lite for my Damascus guns.---Having said that, I never considered what various methods of closing the hole might have on pressures.
There are abundant recipes out there for 10ga. Finding recipes for 8 and 4 gauge loads (with pressures given) have proven to be a challenge.
I mostly use recipes that Tom Armbrust has published. However it is limited. Tom is a big bore specialist. He may have the info.----Daryl
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