eatsleephunt
If you want a Nikon - instead of the Omega - maybe look at the pro-staff with ballastic compensating reticule - far leass exspensive and designed for a regular rifle so that you may shoot any load you want then work out the point projections...
http://www.scopesnmore.com/riflescopes4less/nikon_prostaff_rifle_scopes.htm
#6390
Personally i would suggest you go with the Bushnell Elite 3200 with Ballistic Reticule. It is a graduated reticule for windage and elevation. The optics are outstanding and the rain guard lens are worth a ton... very little use of scope covers needed.... + fast focus eye piece
http://www.scopesnmore.com/riflescopes4less/bushnell_elite_rifle_scopes.htm
#323944B
I have 3 of these on ML and one on my Tikka 300 win mag - they are good scopes in all weather and low light.