Go to the books for pressure figures. No one here is going to quote them by the numbers. To answer your questions, I have used kegs upon kegs of 296, now am into a big keg of 2400 that will be half full when I am dead. The Skeeter doesn't need coddling, nor does the Lefever. Load by the book or add a grain or two if you need it. I evaluate .410 loads by score and sound. My scores are high and my sound is over the limit. That's the way I like it.