Had this MkII 22lr rifle for years.
Action is in a Boyds Pro Varmint Rifle Stock for now.
The eye box of the Meuller at 8.5x to maybe 15x is fine, but at 25x it's so tight it is hard to stay centered.
And I thought it was not holding zero.
I was considering returning it and upgrading to a Vortex Viper 5-25x when I shot this 5 shot group at 85 yards with some old Wolf Target ammo I had sitting around.

Click image for larger version. 

Name:	P1010095_DxO.jpg 
Views:	6 
Size:	295.7 KB 
ID:	9737