I'm using 44gr RL16 with those 70 NBT's out of a 9tw 20in Proof barrel and if I recall they're right around 3400. I could probably use a different powder, maybe RL17, and get them up around 3550+ but it shoots extremely well with this load so it's pretty hard to talk myself into messing with it.What’s those 70’s running? We do a lot of night time yote hunting with thermals. Those would melt them