Contact Tom Armbrust at barbmiller49@yahoo.com.

I don't know what 10-bore data he has or what he may be willing to share, but he has by far done the most pressure testing of 8-10-12 bore rifles and shotguns of anyone I know of.

Also I remember a Double Gun Journal article from way back on 12-bores that has some data. While not translatable into 10-bore, I found it interesting how the pressure varied between brass and plastic cases and if a plastic case was crimped or uncrimped. I'll dig through my collection and see if I can find it.

Bob