Trailboss wi get you the lowest velocities out of those guns. Still talking 700-900 fps depending on bullet weight. You can see the exact numbers by plugging the filters in at data.hodgdon.com. A hardcast bullet as heavy as though two calibers are going 800 fps would still leave I mess in my opinion. Best to load them with birdshot for small critters. I posted how to do that without the Speer shot capsule.