I was looking for something yesterday and ran across an article about Jack O'Connor's .270 in Jim Zumbo's blog. I know JoC had his Leupold mounted in low Tilden mounts but from the looks of things these aren't Tilden mounts. Weaver Top Mount?

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"An archer sees how far he can be from a target and still hit it, a bowhunter sees how close he can get before he shoots." It is certainly easy to use that same line of thinking with firearms. -- Unknown