If you change brand, do another OCW test @ 100.
Verify @ 300-600, depending on what ranges you are hunting at.
My Kimber in 300WM, or my Super America & Model 70 EW, rarely see shots beyond 500 in the terrain I hunt in, even shooting across gullies, so I verify @ 600 so I know what's what. These 3 rifles aren't true LR rigs and I treat them that way.
For my LR, 5R or Sendero, because I will hunt with them to 1000, I verify at that range, if it doesn't hold 1/4 MoA, it gets re-done @ 600 with powder tweaks.
All initial testing for me is at 100. The OCW test is just as good as a ladder at 300.
A node is still seen at 100, the tightest group tells the story, all a ladder test does is verify how wide the node is.
Cheers.