Well, there are a couple things you can do. First, it's ok to clean your rifle every trip don't get me wrong, but my 700 shoots better with a fouled bore. Think of it, you zero with a fouled bore, test handloads with a fouled bore, why would you hunt or compete with a clean bore?
My 2 cents.
If you handload, try some different powder charges, see if accuracy gets better. If you feel like trying a different powder, make it varget. I've never used anything else for 308.
Also, load your rounds a little longer, just off the lands. I load my .308 to 2.9 inches. Works in my gun. This will not fit in a mag, but great for target or competition.
VIGILIA PRETIUM LIBERTATIS
"The price of liberty is vigilance"
America is at an awkward stage. It's too late to work within the system, but too early to shoot the bastards.