I've about finished off a can of FF T7 and thinking about trying FFF. I'm shooting the 45 Cur and the heaviest load thus far has been 55gr with a 200gr XTP which shot very well. I don't think I will try pushing it any further as this is strickly a target gun. Any advantages to using 3F? I did get abit of a k boom w/55gr on a couple of shots which I've not gotten with lesser charges.