It just depends on the gun. I've got a 30-06 Mauser that really likes Federal Premium 165 gr. BTSP. I've tried about 30 different factory offerings and this is always the most accurate.
My Savage 99 used to really like the Remington 180 gr. Round Nosed Core-Lokt, but they quit chambering that. I ended up with a good handload courtesy of our own MILES58 that will be very hard to ever top.
My AR really likes some stuff called Perfecta, but I'm still trying various factory offerings for that gun yet.
I've got a recently acquired Model 70 in .270 Winchester. I'll start with the cheap stuff (Federal Blue Box) and work up from there as necessary. I'm looking forward to trying Federal Fusion through it, but if it really likes the Blue Box, I just may go no further than that.
Different guns like different loads.
