If you have these given facts can you compute the volume of air required? .22 cal ---JSB 15.89gr --- producing either 15/fpe or 20/fpe . Make certain assumptions regarding barrel length and type. i.e. 14" LW barrel. I assume the makers of regulators have a method of figuring this and assume certain standard hammer pressure knowing that a user may change some internals that could later affect the results. That word (assume) always bothers me. There must be a general guideline calculation. Thanks in advance for your input. Nick
