I compiled this test a few years ago. Interesting that the Sako was the most accurate rifle of the group (with Eley) and the Cooper was the only rifle that liked the Hornady ammo better than Eley.
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I came across a used 10/22 conversion , as a first 17m2 then I bought a Marlin, then a Rugger 77/17, then a Cooper. The 10/22 did around 1/2" at 50m, the Marlin around 5/8", the Ruger around 3/4", and the Cooper around 3/8". I did put a Green Mountain barrel on the Ruger, and that got it to just under 1/2". I bought about 25k of Eley, and tried Hornady, and Remington. I did most ammo testing with the Cooper, and Eley was the best, then Remington, then Hornady. At 50m, Eley was around 3/8", Hornady closer to 5/8", at 100, Eley was around 3/4", with Hornady more like 1-1/4". My Cooper in 17hmr, is around 3/8" at 50m and 3/4" at 100m, with CCI or Remington 17gr loads. So accuracy wise, the 17m2, and 17hmr, are equivalent.