Got this bad-boy to the range today to run in the barrel, and run some hot loads through it and get a zero. No issues with developing headspace, no signs of excess pressue with the hottest load, and with a bit of hassle a solid starting zero for 100m. Small targets and grass butt stop made it a pain to get on paper.
No world records for the initial groups but at 3-4 inches for the first 5 shot group off a makeshift box/rest I'm pretty sure I can develop a load or tune the rifle as required to make it a very competitive piece for the year of upcoming competition. It will do for a start anyway.
Happy it appears properly functional and sound.