The explora cartridge is a 2 1/2 inch cartridge using a brass capped lead base bullet or a lead bluff nose bullet of 740grs
Paper cases can be used and blue dot can be used to regulate this cartridge. Mint bores should be .735 and mint chokes should deep ratchet rifling chokes measuring .690. With a .002 constriction for an inch or so just behind the rifling
Super magnum cartridges are 2 3/4 inch same bullets at 1500fps barrel and choke measurements the same.
No commercially available powders will regulate this cartridge safely although some do exist