I have had this for ages I did not paint it this is how it turned up along with a WWII Bofor 40mm in the same paint scheme. I do not know what cal it is only the owner said it was to check the cyclic rates of a gun (GAU!) I am trying to find out a bit more on it the Boyes .55 inch is for comparison, the projectile has no markings, the screw that goes in the primer hole has SPS on it, the base has 087 M 96 (DOM?) as always I appreciate members input TIA
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