Weight of ejecta is only one factor affecting pressure. The friction of column height is another. Yes, pressure and velocity are independent, but an unplanned loss of pressure through inefficient sealing can affect a loss of velocity. In an early Lyman reloading manual it offers caveats of recommended numbers of nitro cards and column heights of fiber wads and states best vs. worst combinations. RST seems to have it figured out as some of its fiber wadded loads use only fiber wads without the nitro card. And don't get lulled into a feeling of security by using old recipes in newer paper hulls by Cheddite. These aren't your grandfather's hulls as the newer Cheddites have molded plastic bases internally as opposed to the old non plastic based hulls.
Boats, what did you use for fiber wads? Gil
