Hey thanks for the reply!
I noticed that 14CFR 101.22(a) specifies a maximum propellant of 125g. I wonder if this means that a person could launch small high power rockets w/o a waiver. I remember a while back, most notably after 9/11 when we couldn't get waivers, some were launching small H motors claiming that you didn't need a waiver.
If memory serves, the FAA differentiated between 125g total propellant, 62.5g per motor, but the NFPA did not. NFPA said just 125g total propellant as the difference between mid power and high power. For me right now it doesn't matter as I let my Tripoli membership lapse in 2002 (I'm now with NAR) so I lost my level 1 cert and can't buy HP motors anyway.