I had a 308 Baikal many moons ago, and asked the local gunsmith to fit a picatinny rail as the dovetail was too short for the scope I wanted to mount. To keep it nice and low he machined off the dovetail and a bit lower again - theres plenty of meat there to do it. Then he fitted a picatinny base on top, cantilevered about 40mm in front of the action. He suggested at the time, that if I wanted to fit a larger scope, or make it even stronger, he could machine the underside of a picattinny rail so that it had a "block" right out at the end of the cantilever, that would extend down to the barrel, and could have another mounting screw in to the barrel. That rifle was bloody accurate!
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