Well to start, I'm new at this. I just got a golf ball cannon and I can't find FG with out having to order 5 pounds at a time. Places where I can order only 1 or 2 pounds at a time, OUT OF STOCK! My local gun shop only carries FF, and FFF ( plus they only order B.P. twice a year). So what I have read is that some people say no to FFG while others seem to use it in mortars. Can I use FFG in my cannon (pushing a golf ball) with a lighter load and still be safe? Powder chamber is 1"x3" and barrel is 11". And if I can get by with FFG, what loads would you recommend?