I spent the day on the range with my reloading press and a selection of bullets. This was at 100 yards with a 24" Alexander Arms upper. It was 75 degrees F, 244' above sea level.
I got great results (.5 MOA and better) with 120gr Match Kings (30.5gr AA2520) and 90gr Speer TNTs (30.5gr Benchmark). Those TNT's were screaming along at 2950 fps. (I ran out of light for the chrono before I got to the Match Kings.) One of the 5 shot Match King groups looks like I only shot 3 shots
. I did have one batch of Match King loads that I accidently seated a little deep (2.20" OAL) which opened the groups up to about 1.2 MOA, I adjusted to 2.26" OAL and was back to .5 MOA or better.
I wasn't happy at all with the Lapua Scenars in 108gr (using H335) or 123gr(using AA2520). They were consistantly giving 1 MOA groups but I couldn't get much better out of them. I varied OAL and powder charge, but couldn't get them to do much better or worse.
I couldn't get 129gr Hornady SSTs (using AA2520) to consistantly group well either, they were grouping between 1 MOA and 2 MOA.
Next time out, I'm going to try some 120gr Nosler Ballistic Tips, and I'm going to try some BLC(2) with the Match Kings and the Ballistic Tips. I'm going to try some Varget with the rest of the 129gr SSTs.