Builder mentions getting unexpected pressure yield from shortened hull and Hartin crimp which if I remember right is a fold crimp of the remainder of previous factory crimp on top of overshot card. Makes me wonder about the relative "containment" strength of the various crimping methods and if this has any effect on chamber pressure. Does anyone know if either the Hartin or the outmoded roll crimp would generally be associated with a higher pressure yield than would the industry standard fold crimp, given same payload and charge?

jack