Thanks Richie, that's extremely helpful. Very nice primary group on the metal. I've not hand loaded before but I'm pretty sure I would enjoy it. The only potential problem being my tendency to be a bit obsessive and, as my wife would say, I might "disappear up my own arse". I like the idea of being able to drive the 73gr eld's though. Are they any good on foxes or just stab them like a knitting needle? I would also be interested in working out a hand load for the 53gr hornady vmax's to achieve better than factory-load accuracy. There seems to be a bewildering array of options for brass/primer/powder/bullet/seating depth, so I'm slightly anxious that I might simply create an expensive and time consuming way of making ammunition that's worse than factory loads, particularly if Sako's 55's will print 1/2" to start with. I'm not able to shoot much better than 1/4"@100y anyway.
By the way, did you get the 20" or 24" barrel? Article here suggests there's not a lot in it, so I was thinking the 20", particularly given the availability issue.
https://www.80lowerjig.com/80-lower-blog/the-ar-15-picking-the-best-barrel-length-twist-rate/
cheers, Giles