Trailboss was developed as a powder for originally black powder pistol
rounds with large volume cases. It will fill the case with a light load,
lessening the chance for a double charge . It has a very high
volume for it's weight. Cowboy action shooters were the original market. They seem to like it, even if it does smell funny.
Just keep adjusting your powder measure until it drops the proper weight
of powder per your reloading data. I use it for bunny fart 45 ACP
loads for my S&W 625. Works great for ICORE competition.