You have already ordered, but in case anyone else needs advice, the Leupold low rings would not work on my Omega with a 3-9X40 Leupold scope (scope actually touched the barrel with the low rings). The Med rings were a perfect fit and the scope is rock solid. That thing has traveled across the country this year and not moved a bit. Rings and bases are so important, maybe even more so than the scope itself. The ultimate load I have come up with for my Omega is 120g loose Pyrodex with a 200g shockwave (for deer sized game), very deadly.