My old (early seventies) SBH would keep its favorite load inside two inches at 100yds all day if I didn't screw up. This was with a 2.5x scope and a sandbag. Sadly, Hornady changed their 240gr JHP, and I haven't yet found another load that is as accurate. The original recipe was 10.5gr Unique over a Federal LP primer. I can't vouch for new Rugers, but my old one is damned accurate with the right load.
"Of all the things I've lost, I miss my mind the most." A. Brilliant