I haven't had good results with AA1680. It seems a little slower and lower pressure than H110/W296, Lilgun and MP300. These seem about the right level of burn rate to get the powder to build enough pressure to expand the case and seal off the chamber from the combustion gasses. With 1680 I found the cases and chamber to be covered in soot. With the other powders not much if any soot. This tells me the 1680 is a little slow for this cartridge. Anyone else see this?
All of my favorite creatures have white bottoms.