RE: Magnum R throws & CG
I have my manual here in my desk for some reason, and here is what it prescribes:
Elevator - 10mm up and down
Aileron - 8mm up and down
I used to use triple rates, but I fly single rate with a lot of expo now after getting used to the airplane. 10mm is a LOT of throw for flying at speed, but you'll use it up on landing esp. with forward CG's.
The recommended CG is 120-130mm "from the wing root" - meaning that it is measured from the LE at the root.
The recommended CG is very, very forward however. I did a NP workup on the Magnum and was shocked to find out where the CG would be located if calculated by normal methods with normal static stability margins - 190mm plus!
The standard recommendation is now 135 - 145mm. You'll be fine starting at 130 - 135, then moving back as you see fit. Naturally the induced drag is higher at the more forward CG's, and the already tough job of flaring on landing becomes even tougher.
Hope this helps.
MJD