Three way tie. 625, 14, and a Ruger OMBH in 45LC with an aux cylinder in 45 ACP. All three will shoot cloverleafs at 25m with the hand load they like (off a rest).
Standing on two legs - An OMBH in 41 Mag with a short barrel and a hand load. It is still a mystery to me after all these years, but, I can make hits at ranges that most folks would call BS on unless they see it in person.