Been away from BP for awhile, anxious to get back into it. I've got an inline .54 cal cva. I've heard good things about powerbelts, my question is what is the advantages and disadvantages of aero tip and hollow point. Need a little education on them.What grain bullet should I shoot, ifI preferto shoot 90 grain of powder. (using pyrodex rs). Another question, I got some powder thats about4 years old, should I just toss it?