A while back I pulled some info from one of the powder manufacturer's we sites. Looking mostly for pressure ratings. I load only Rem. nitro hulls. Since there was no load data for cheddite primers I was told they are similar to Winchester primers. Since I just purchased two 8# jugs of clay dot that info is what I jotted down.
rem. Nitro hull, claycuster 4100 wad, cheddite primer:
17.5grs. 5400psi, 1200fps
18.5grs., 5760psi, 1250fps
19.0grs., 7020psi, 1310fps
Same load components with a Rem209a primer and Clays Powder
16.9grs., 5800psi, 1200fps
18.2grs., 6700psi, 1250fps
19.6grs., 7600psi, 1300fps
All loads are with 7/8oz of 7&1/2
I also contacted a test facility in Maryland to see exactly what pressures my loads were since I have a Damascus barreled Parker. The gentleman I spoke to said they would do five four shot tests and because it was just me personally and I was not loading to sell the ammo, he would give me a break in the price. Normal price was$700.00 and they would do it for me for $500.00. Needless to say I will just go by the data I received from th web site.
Tom
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