Tejano,
I found his comments on case shape interesting, because maybe 3 years ago I had extensive conversations with the head techs at two major piezo labs, Both were adamant that case shape does NOT affect powder-burning "efficiency," in the sense of getting extra velocity out of the same case capacity. But both found case shape to affect powder-burning consistency, with shorter, fatter, steeper-shouldered case (like the WSM) resulting in lower spreads in both pressure and velocity.
Which is one I asked Llama Bob who he worked for, or whether he has his own piezo lab. Am always ready to learn something new, especially after he claimed the list of 7mm magnum loading data in my post was all inaccurate.
