Well . . . am still getting good results with 42.5 gr of IMR 4064. So, yesterday I played with seating depth's for these 175 gr Nosler Custom Competition bullets running from .003 off the lands at .003 increments to .015 off. None of them did as well or any better than being .003 off. The 42.5 grs gave me a 5 round group of .372" (not quite as good as the SMK's gave me, but close). And with an average MV that I've measured with my MagnetoSpeed V3 of 2676 fps, I feel this is the 4064 load I'll be sticking with for whichever 175 gr bullet is load up.Picked up 500 175 gr Nosler Custom Competition bullets for a really good deal on a close out. I ran out os 175 SMK's, so I loaded up 50 of these using the same cartridge specs as above and they did almost identical results on paper. Don't know what MV I had, but I'd bet it's pretty close to the same too. Group were on target hitting the POA dots and grouping just under .5 MOA. I think with a little adjustment in seating depth, they can do a lot better (though I'm never to sure about the shooter at such an advanced age ).
Since I have a jug of AR-Comp and ran a previous load that I developed for my old barrel, which was 39.6 grs set with the same specs, I tried it with this new barrel and got pretty good results (again) with it. 5 round group was at .263" and firing 10 rounds to get chrono numbers I got an ES of 26, an SD of 7.5. and the MV average was 2603 fps. These were loaded in full length sized Peterson brass. I tend to get better groupings with neck sized only brass than I do with FL, so I'm gong to see if that holds true with this load. I've been really liking this AR-Comp powder for my .308.