My last case of Goex was all 3F except one can of 4F. My .62 trade gun prefers 2F, but 3 is versatile in my 16 ga. SxS, .32, .50 and both .54's. Can prime out of the same horn just fine. Works fine from cottontails to moose, even deer, antelope and a mountain lion. Been killing big game since 1962 and NOT ONE critter has ever complained about what killed 'em. Good luck hunting.