I had a Rem. 700BDL in .270 Win that would also consistently shoot 1/2" groups. My load was 54 gr of IMR4350 under a Nosler 130 Ballistic Tip. But like a dumb a$$ I went and sold it to reduce my inventory. Sure wish I had that rifle back! It was a 1970's vintage that came with a hand checkered stock from the factory.
But that wasn't my most accurate rifle. I had a Rem 700BDL with a bull barrel in 7mm-08 that I used for high power silhouette that I shot a 3/8" group at 200 yards (3 times). And I currently have a Savage 7mm-08 in the 11 youth version that has shot 1/4" groups @ 100 on occasion and well under 1" most of the time.
So with the right loads, some factory rifles are capable of shooting right alongside expensive custom jobs. Not all, but some.