There has been in a bunch of discussions about "max" loads, and how mfgs write that. The red warning does not specify which type of powder, real black or subs, though the load data never recommends above 100 grs., of anything. But some, specially out west are using 150 grains with the barnes for elk and blacktails. I don't go above 100 myself, not only because I don't think my shoulder can take it, but because I have found that 100 grains gives me pretty good accuracy at 100 yds, and I never need to shoot beyond that. I have only tried 90 grains in BH209, and 100 in 777, so don't know how stout a 150 grain shot would be in those, but have used pyrodex and goex at 150 grains some time back.