Looking at a burn rate chart; Titegroup is right next to Bullseye -- So it should be a good powder for shotshells. Your capsule will weigh 138-140 grains when loaded.

I use Power Pistol in 44 and Red Dot in 38 shotshells. Light loads SOMETIMES pattern better, but 44s seem to be more forgiving than 38s.

Be sure and crimp or you'll tie up your cylinder. I've never broken a capsule from crimping; although others have.