They are a favorite bullet of mine. In my Black Diamond XR I shoot 100 gr of Goex 2f a Winchester Primer and the SSB's. They are an excellent combination.
This is how they grouped at 100 yards after a long day of shooting. The UPS man came with them as I was out shooting, and I had to try them. Needless to say, I was real pleased. I have not tried them at longer distances. So your observations about fast drop could be very accurate.
In my Knight I shoot them with 110 grains of Triple Se7en and the accuracy is very good. I know one person that used them for elk hunting. He shot his elk at 70 yards (as I remember) and although the projectile did not get pass through, it did penetrate to the other side under the skin, expand fully, and do some excellent wound channel damage. The result was the elk made about 40 yards and just fell over.
They have to be one of Buffalo Bullet Company's best. Now the 285 grain I do not like. I also tried some of their other weights and did not have much luck, but the 375 is a stand by load.