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That bullz eye pro sounds a bit like the dioptre fullbore shooters use. Ive tried one and the target seemed a good 1.5x bigger through aperture sights. Quite blurry because it wasnt my own but much...

For prone shooting you’re often looking through the top part of the spectacle lens. People doing smallbore used to get a specialpair made with the optical centre groundat the point you looked through...