My guess would be they were designed to be used in hulls that had a thick basewad in the bottom. I have some paper Winchester Ranger hulls I reload that have a basewad thats almost 1/2in thick. I have to use the older WAA12R wads to reload em.
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 "Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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