ONE MORE TIME:
You have to read in the "Context" of which it was written. The part SmallBore quoted from Burrard is in fact totally out of the context to this question. It applied to loading, as he called it, the "True" 2 3/4" cartridge, put up with 1¼ oz shot, a heavier powder charge, higher pressure & at the time he wrote that, in a roll crimped shell which would come about even with the end of the chamber as loaded.
I quoted to you "WORD FOR WORD" exactly what Burrard said concerning putting up the regular 2½" load in a longer 2 3/4" case when the fold crimp replaced the roll crimp. There was NO increse of pressure, Apparently you are totally unable to Read & Understand. This was also borne out by both Thomas & Bell.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra