Had a lovely day today. Got to the Armourer first thing and both my rifles passed the Rule 150 chamber check - and he had the same measurements I did. So huge relief that both my rifles are legal and don't need to be touched by a gunsmith. Today's relays were 300yds (10 + 2), 500yds (10 + 2), 500 yds (10 + 2), 600 yds (15 + 2). I had a bit of a dodgy start at 300 and I was hating life. I was blaming my head position, and the issue ammunition until I got off the line. Then I went to record my sight settings and realized I had left them on 20 (my elevation zero) rather than putting on 23 (the correct zero for 300yds). 500 yds went much better though the wind was quite difficult to read. I had to come up a good 3/4 minute from my normal elevation zeroes with my handbuilt ammo and I suspect that the GGG we've been issued is quite slow. As a coping strategy, I changed to my Krieger-barreled action - it is a tightbore barrel so will raise the pressures a little over my Lilja. Had a nice 2nd shoot at 500 - at least as far as elevation goes - and the elevation was with 1/4 minute of my Lilja barrel. So I guess slow is slow and the barrel ain't gonna make much difference. Finished at 600yds and had another excellent elevation shoot (kept 15 of 17 shots within 1/2 minute elevation) but was again somewhat flummoxed by the wind. I've determined that in swapping sights between my barrels I've lost a solid zero on my red sight (fitted to the Krieger). I've made a good educated guess to compensate and I will use this barrel and sight combo again in tomorrow's 900 and 1000 yd matches. Here's a video of Century range early this morning. Quite a lovely place to shoot. Temps in the low to mid-70s with a nice breeze. Perfect England.