Many paradoxes were never black powder guns. Holland paradox guns were regulated for a variety of charges and cordite types 28 30 33 36 and 40grains of cordite have been documented.
The unique load developed by Ross is a pretty safe load and will regulate many paradoxes with slight variations even early blackpowder paradoxes. Exploras all were originally regulated with capped bullets at 1250 and a bit of tweeking to get them right
20 bores are rare and if a Westley need a special powder for regulation 425gr bullet at 1500fps
