With the round rear actions, you can measure the thickness up front vs at the back and you will be able to tell if it is sloped or not. Shorter in front = sloped. Mine on an LRH was sloped. I will measure it and post the specs later. If yours is made of aluminum, I would suggest removing it and replacing it with one made of steel. From my experience, aluminum bases do not hold up well on the 338 Lapua.
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