Another accuracy robbing issue I often encounter is the length of the front base screw. I only use Talley LW low's on a Montana. The front most screw is longer than needed. The bottom of the screw bottoms out on the barrel threads. This prohibits the base from being fully seated and allows the front of the base to move. Not to mention the fact that you could be messing with barrel harmonics...

The picture below shows shiny spots on the threads. They don't look like this from the factory. The shiny, flattened spots are a direct result of the screw making contact. I don't have a "before" picture in Photobucket, you'll have to trust me on this...

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The pic below shows all four base screws AFTER the front screw has been shortened. All four screws are the same length when shipped from Talley. I shortened the screw on the far left with a Dremel. I'm posting this pic as a reference as to how much I take off the screw.

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I enjoy handguns and I really like shotguns,...but I love rifles!