Lancaster,

Thanks for sharing. I am surprised that they recommend FFF for 43 Mauer and 450 BPE. For the 500/450 #1, they recommend FFF for 270 gr bullet but F for the 310 gr bullet. I had always used FF for these cartridges.

I will try FFF in my 43 Mauser DR to see if I can get it to regulate better. It shoots wide (right barrel to right and left to left so needs more velocity. or less momentum.