Matt,
I hope the following loads will give you a good starting point.
1. SPS open gun ( 4 hibrid ports, 5 ported comp, 8# spring) Remington brass, WSPM primer, 124 gr PMC FMJ, OAL: 1.220
- 3N37: 8.2-8.4gr, PF: 169-173
- Vectan SP2: 9,2gr, PF: 168-170
2. SVI open (4 hibrid ports, Venturi effect SVI comp)
- 3N37: 7.8gr, PF 165-167
- SP2: 9.0gr, PF 162-166
- 3N38: 9.2gr, PF 163-165
I have experienced less muzzle flip with 3N38 and SP2 but SP2 meters badly from my D650. I never had any problems with 3N37 but it produced some "double ignitions" in my friend's gun. I use EGW 9x19 resizing dies and abandon brass after 3rd-4th reload.
115gr bullets produced less flip for me but as you can't make major under 120gr here in Europe I don't use them any more.
DVC!
Klev