Primer Tray Funnel

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This is a custom primer tray funnel designed to make loading square primer boxes into round primer trays easier. I took precise measurements from Federal primer boxes and round Lee Auto Prime primer trays to create this funnel. If you want to customize it further, note that the RCBS primer tray has an inner diameter of 95 mm, while the LEE loadmaster primer tray has an inner diameter of 82.9 mm. If using Federal primer boxes, set the inside width to 89 mm for a smooth fit. Alternatively, if using CCI primers, try setting the inside width to 76 mm or use the Primer Box Spacer and the Primer Tray Spacer for added flexibility. How I Designed This Custom Funnel To create this custom funnel, I used calipers to take accurate measurements of a Federal primer box and the inside diameter of my primer tray. Then, I came up with a clever way to connect the two components, making it easy to load square primer boxes into round primer trays.