I have used GOEX plain FFG and FG as well as cartridge grade. I have yet to buy any express but I have also shot Elephat brand FFG and FFFG, Shutzen FFG and Swiss 1.5. I also have used until it was used up some Curtis and Harvey FFG and Pyrodex P and RS in BPCR for one thing or another. Interestingly I have gotten excellent results from all of them in the area of 1 to 1.5 MOA with some tinkering. I will say that at longer ranges like 800, 900 and 1000 yards I like a bigger cartridge than 45-70. I have competed with a 45-70 at those ranges but if I were to do nore of it I would definatetely get either a 45-90 or a 45-100 chambering. However, I am not likely to do that type of competition in the future so I stick with the 45-70. I have also found that a bullet of around 500 gr works very well in the 45-70. I have shot heavier bullets but the one time I did shoot extream long range (1200 yards) I used a 500 gr government bullet over 67 gr of FFG GOEX. I managed to come in third in that match though that was when my eyes still worked well. By the way the guy who won that match was shooting a Muzzle loading Parker Hale Volunteer rifle with a 480 gr bullet and `30 gr of FFG Goex. He only dropped 1 point and only missed the X ring twice. I am still in awe nearly 20 years after the fact.