the OP says it was regulated with Federal ammo (I'm assuming at 50 or 70M).
this means RL-15, Hornady cases and Federal 216 primers (not available to us). no filler.
Mine was regulated with Wolfgang-Roney ammo, which I gather is a blended or proprietary powder.
Anyhow, in a free-to-recoil 470, I've not seen a huge difference in H4831, IMR 4831, RL-15 and RL-22 in terms of regulation. It's just a matter of finding the right formula (and not shooting too much per session so you don't muck the data up).
I think he did pretty well for first time out. this takes a couple months to really nail down.
