This is my first post in this section!

I'm sorry if this has been covered to death in the past but I can't find any recent posts on the topic.

I have a Ruger Old Army .45 which I'd like to get around to using. I don't have an explosives licence so I'll be needing an alternative propellant to black powder. Pyrodex & Triple 7 are looking like my options, unless anyone can offer any more?

There's a few options with Pyrodex, and Triple 7 has an FFG & FFFG configuration (size of the granules?) so I was just wondering from peoples experiences what works well?..and in what quantities?

Any advice much appreciated.

Cheers
Greg