Ok, so I'm slow reading all this, like usual.
I used to think the perfect (reasonable) rifle was a 700 in .308. I've changed my mind. My old 700 was doing good to shoot 1.5 MOA. It had a sporter barrel, but was still plenty accurate for what I needed it for.
Then, a few weeks ago, I bought a Savage 12FV in .243 that shoots well under .5 MOA out of the box. Best group is .319" at 100 yds while fireforming brass and breaking in the barrel. One of the best parts about a Savage is that barrel changes take under 15 minutes and anyone that can't handle it shouldn't be allowed to own guns
And now I'm trying to find a .260 barrel I can stick on there when .243 gets boring.
Someone said that .308 was better than 5.56mm or 6mm because of the higher ballistic coefficients of .308?
All bullets are Hornady, just because I like them:
.30 cal 178 grain AMax BC=.495
.22 cal 75 grain AMax BC=.435
6mm 105 grain AMax BC=.500
6.5mm 140 grain AMax BC=.550
Up to 500 yds I would (and did) pick .243. 500-1k I'll take .260 AI. Past that .338 LM out to .50 range. Savage for the first two, maybe the .338 if it'll somehow fit, and McMillan for the .50. Gee, and I wonder why my wife confiscated my credit card?