Plenty of loading data for smokeless on the net but first and foremost the warning that a trapdoor was designed for black powder pressures and any of the smokeless loads that will be listed can easily be double/triple charged. One double charge is all it takes to destroy a trapdoor so caution is the rule. Wise reloaders throw one charge, verify the charge is in the case, immediately place a bullet and seat that bullet before advancing to another case. That means no progressive loaders, only single stage and no distractions. It only takes one time to make bomb so have all your antennas up and running before you start loading for one of the most enjoyable rifles there is to shoot.
Almost forgot, I use Accurate 5744, the powder that has destroyed more black powder guns that any other in recent times. Used wisely it is the most accurate smokeless powder currently available for distances past one hundred yards in a trapdoor.