I like to use mild loads. They make your stuff last longer. When looking at the 308, the only choice with a high enough BC that will also be most accurate at mild pressures is the 175/185 grain weight. There you find several brands and two ogjive types. I like bullets that jump well, so I choose bullets with tangent ogjives. That limits me to Sierra, Berger, and Nosler. I like Sierra cuz it's the shortest.
Powder, I like Varget and IMR 4064 4895 and Reloader-15 and anything else that I can get my hands on. I use QuickLoad to predict the velocity and barrel time and match the charge weights to the calculated nodes assigned to my barrel length. Incredibly, it all works! I'm getting good velocity, great accuracy, and my brass lasts forever cuz I'm only generating 50,000 PSI. Sometimes I get a little bold and explore the higher pressure range, but then I realize it's not worth it.
I used to load blind, but that only resulted in wasted time, components, and frustration. I would find what I thought was "THE" load only to realize it wasn't the next time I tried it. People would tell me it was the weather, or voodoo, or whatever. It wasn't. It was the load. It sucked. I was outside its sweet spot because I did not understand what the sweet spot was. An occasional lucky quarter inch group is not a sweet spot. I did come up on a few good loads that way, only by sheer luck, and they happened to jive with the QL/Node thing and I cursed the previous 15 years of wasted time and money to hell.
Get QuickLoad. Get the barrel time node chart. Get the most out of your gun and components without waste.