This is my own speculation, but I wonder if there was some motivation by HK to not allow intermixing of SFP and VP9 in the same market for some reason. Anyway, "no soup for you!"
Anyway @Montrala I'm gonna go listen to 40:1 by Sabaton now while caressing my VP9 and wishing it was a SFP...
Keep your booger hook off the bang switch till you're ready to bring the hate
I'm pretty sure the VP9 isn't officially rated for +p+ either. The manual simply says "brass-cased ammo manufactured to SAAMI specifications" which if I'm not mistaken +p+ is NOT.
IIRC, and as many forums mention, Klaustrophobia is correct, as there is no SAAMI standard for +P+, most manufacturers including HK (I checked VP9, HK45, Mk23 Owners Manuals) say including +P but don't mention +P+
VP9 - all 4 of them :-)
HK45 V1 German Made
HK45 V7 US built
HK45 V1 US built
HK45C V7 OD
HK 45C V1 German Made
@Klaustrophobia and @WolfieRules I'm not a reloader so don't really know much about SAAMI parameters. I agree with your comments about what's published. The +P and +P+ info comes from HK's VP9 armorer course. I wonder if there is a way to convert the "impulses" measurement published by HK (which I think is a measure of acceleration) to PSI which is what +P and +P+ is measured in I think. I Googled and didn't find any ready converters. That might be the more scientific way to know the answer.
@omega21 , found this on SAAMI website, been long time since I did math this complex, http://www.saami.org/PubResources/GunRecoilFormulae.pdf
That said, as armorers course said no +P or +P+ for SFP, most I'd go is +P, here's pressure chart by SAAMI, including +P, as there's no standard for +P+ it's up to whomever loads it, could be 5% or 50% over +P, which is why most OEMs won't certify their pistols for it, http://www.saami.org/specifications_...essureData.pdf