No problem at all.
KNSU doesn't have to be heavier, but there are trade-offs.
KNSU has higher density and lower ISP than APCP, so you can shoot for equivalent performance with a size/weight trade-off, or equivalent motor size or weight with a performance trade-off.
Either way there is a compromise. APCP is the dominant propellant for a reason ;)

Are there any retailers within driving distance that regularly stock AeroTech?
If you can sweet-talk them into getting you RC reloads with their next order you might avoid the HAZMAT.

Yes that includes the hardware.
NAR states the initial mass is 131g.
AT state loaded motor weight as 126g.
No idea why there's a 5g discrepancy.
Maybe NAR included the igniter and nozzle cap while AT didn't? Who knows!

I found this video on Sugar rocket motor manufacture this morning on Transterrestrial Musings...

http://www.transterrestrial.com/?p=67547

I found this very interesting, but the nozzles seemed crumbly when he drilled them. I wonder how often these motors blow their nozzles out...........


Joe

I was wondering that myself.