I've got a couple of CMP-sourced 52Ds - one in its original stock, the other wears a nice claro walnut prone stock by Doan Trevor. I have a Weaver T24 on a Ken Viani mount on the D in the factory stock, and a nice old Unertl 16x on the one in the custom stock. I've tried some good, lot-tested Center-X & SK Rifle Match in both these factory D barrels, and neither of them shoot these rounds nearly as well as some random lots of newer Eley black box Match. That's contrary to all the custom barreled 40XB & Vudoo repeaters & single shots, which all prefer SK or Lapua ammo, even though all the repeaters are chambered with my EPS reamer...go figure. The two Vudoo single shots have Benchmark 3-groove & Shilen ratchet bbls chambered with a Nevius reamer, and because they've shot so well with lot-tested Center-X & various grades of SK, and because Kevin Nevius mentioned that his reamer is a bit pickier when it comes to shooting anything besides Lapua, I haven't even tried any of the few lots of Eley Match I have in either of them.
ETA photos of CMP 52Ds