I installed my extra scope, a burris 3x9 compact, on my rem nylon 66, and I maxed out the elevation adj and it still shoots 5-6" low at 25 yrds. The scope has been on a ruger M77mkII, .223 and it was zeroed just fine, then it went to a M1894 marlin 44mag,also zeroed fine then it sat on the shelf for 6 mo.
Anything I can try to raise the poi? BTW i'm using millet 3/8" grooved rings.