I know this is an old post. But I happened across it.
Nikon Omega on Ruger #1 - 24hourcampfire
This links shows pictures of a Nikon Omega 3-9x on a #1. This is an excellent scope for the #1. It has 5 inches of eye relief. That eye relief is constant at 5 inches from 3x to 9x. That gives plenty of room on larger calibers, and also works with the rather forward position scopes have mounted to the #1.