I use N340 quite a bit, and 7.5gr gives me about 1150fps behind a Remington 158gr SJHP out of my 5" 627PC. Be careful though, as this is approaching a maximum load with this powder (VihtaVuori says 7.7gr is max, at a COL = 1.575").
Personally, I find N340 better suited to lead bullets than the jacketed variety, especially so with Missouri Bullet's 158gr cast lead SWCs.
My lot of N340 is very close to Unique in performance. YMMV