Esox357,
This comes straight from the Hodgdon site. I have shot T 7 for a long time. It's a very good powder that shoots excellent groups out of my Omega .50 cal. Especially the FFFg.
Triple Seven is a high energy product designed to provide the muzzleloading hunter with higher velocities when used in the same VOLUME as blackpowder.
To duplicate a blackpowder load velocity using Triple Seven, you must decrease the powder charge by 15%. *See WARNING below.
Here's the link to Triple 7 load notes:
http://www.hodgdon.com/loading.htmlHope the helps.
Paul