I found that with bullets cast from the Lee modified mould, I can put 45gr of FFFg in the starline 56-50 cases really easily if I used my drop tube. (40" 1/4" copper tube with a Lee red plastic funnel at the top)
If I don't use a drop tube, I only get about 40 gr or so of uncompressed open air powder. (FFFg)
GOEX tends to compress slightly less (or requires more pressure) than does Pyrodex "P".
I backed off the 777 to 40gr...that stuff is really not your friend under LOTS of compression. (just "kiss" is what I have been doing)
9.2gr of Trailboss is about where I would be shooting these bullets. (which is about 20% more powder than what you can load a 45lc up with...for CAS..for a cartridge case that is about 40% more and bullet that is 1/4 more)
Is there a running list of loads and bullets that folks have come up with?
[I hope to chronograph my loads as soon as my @$#&! carbine arrives...hopefully, next weekend]