Well there you go mate, I stand corrected - well done. IMO you're at the pinnacle of the economy/accuracy combo for loading 308 in AUS. If AR2208 is working for you, I'd just stick with that - I doubt you'll get much accuracy improvement from AR2207. Worth an investigation nonetheless. I'd be chronoing your loads and comparing the SD against AR2207 i(f you want to split hairs).
My only gripe with the 08 is the noise, it sure slams the eardrums. I forgot my ear pro for one round and I'll never be repeating that mistake again, its been a few days and the ringing hasn't stopped (I've got the rifle braked and some past ear injuries). I'm hoping the faster powder might improve that aspect a little.
I don't yet have a chrono, its definitely on my list to get asap though because I keep running into situations where it would help.
That sounds about right mate. For a factory Howa barrel you're doing bloody well I reckon
Thanks mate, for a first rifle this Howa will keep me happy a while yet