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I always had this problem with my long action rem 700 but i bought a burris 3-9x40 fullfield II and didn't need the extension rings.I have a bushnell elite 3200 4-12x40 that also fits without the extension rings.I hear the new redfield 4-12 will fit also.
Zeiss conquest 3-9. Not as high magnification as you want, but the excellent definition of this scope and the long eye relief make up for any magnification shortcomings.