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It's a special bushing for 16 grains of 450-LS powder. Powder made by Winchester, before 1964. Fast burning powder.

Just mic the inside and use it as whatever size it measures.

Ajax
 

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What Ajax says is what I think also, as I have several similarly marked ie 17 RD--24 Herco--etc. Just use a good scale and whichever bushing gives you what a published recipe calls for. Ross Puls
 
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