Suedsh,
I believe if you have a special base with several rare earth magnets to hold it down to the rib, and put it on against the back of the standing leaf of the rear sight, it will hold. You might think of a projection on each side of the rib, to prevent bumping it sideways. These little magnets are vary strong and can be stacked to increase the strength, as well as using several stacks epoxied into counterbored holes in the base. This wouldn't require modifying the rifle. I don't know where you live, but Federal loads 450/400-3" now, and new Kynoch is being produced.
Mike
Last edited by Der Ami; 09/08/17 04:42 PM.
