I don't have my notes with me , I'll post them later. I didn't get a chance to chrono the 4.8 rounds as I ran out of time.
When testing new loads..............my goal is to have every bullet tested to exceed the PF floor with a plus 5 PF buffer (950 FPS). Then there are no worries for the chrono stage and dealing with the possibilities of temp change, light bullet weight, humidity elevation, chrono measuring differences and most importantly Murphy's Law!
With that being said and I use N320 and Zero 180 FMJ, I think you might need a couple of more 1/10's of a grain.
Your choice.
With 4.7 I was at 166.5 PF , I set my 550 up so the average was 4.79-4.81 grains. This powder doesn't meter like TG does, it's like a mini Varget without the ether smell being a stick powder. My gun shot great and I think this will be a solid load for me, now if only I could find something to make myself move faster...