JB thinks that it is more accurate generally than the .22/250.
Many years ago a gunwriter wrote that Ruger had records of their test fireing results of all rifles made. This was before they began making their own barrels; rifled barrels were taken from the stock pile then chambered for whatever .22 was being made. Their records showed that .220s were more accurate than .22-250s, average for the thousands tested had group size for the swifts less than 2/3 the .22-250s.
I have an early M77 mkII, before the two-stage trigger. I haven't grouped it for some time, but at 2000 rounds it still put 10 plastic tipped 55 gr. bullets into 1/2" at 100 yds, at a bit over 3800fps, with either RL15 or VVN N150 and CCI match primers. It didn't matter if they were Nosler, Sierra, or Hornady. A friend got one after the trigger was changed, it was just as accurate, though his rifle needed a bit more powder to reach the same speed.
I save mine for 400+ yard P-dogs, the barrel does heat up pretty fast, and recoil is enough that with a 24x scope a spotter really helps.
