I am shooting a modern single shot with a 350 gr gas check boolet cast of 20:1 alloy and want to get the most velocity that I can get with an accurate load for hunting. Since powder is scarce I tried Vihtavoiri N133 with good results starting at 30 grains up to 39 grains. Since I don't have a chronograph I have no idea what velocity I got but no leading occurred so that is good! Any ideas how much more I can go or some other loads with another powder that might get me to 1800 fps. Thanks. Tom