Hello, I have a inquiry about Graf black powder. Most of my experience using black powder has been with Goex but what I've found with Goex and with all things being equal is that I get a different POI when I change lot numbers of that brand. Sometimes the change is significant which is frustrating when your sights are fixed. I shoot flintlock rifles. I have been told that Swiss powder will eliminate this problem. However, due to it's higher cost I was also curious about the Graf brand. Does anyone have an idea how consistent the Graf powder is from lot to lot? Thanks.