I have always followed the loading data that was published. I want to know how much of a diffrence it makes to use a small rifle primer instead of a small pistol primer. .......
I don't have pressure guns and I doubt very many people do, especially vented to mimic revolvers. So I can't give you any information at all. Perhaps the Oehler 43 works with Thompson Center single shots? Be interested if anybody at all can reference ballistic lab tests.
I can say that I follow the loading data as published except for 9x23 where I use small rifle primers. BUT so does some, but not all, of the published data. I do use a chronograph and match velocities against published velocities in the published loading data.