What is this hole for in the primer?
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3M High Strength Small Hole Repair 8-fl oz Color-changing, Heavy
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Figure 2 from Spit-Hole Effects on the Ballistics of a 7.62-mm
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Primer Pocket and Flash Hole Uniforming Basics « Daily Bulletin
Nobel Sports Primer - No Flash Hole Cover
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Reloading 101: Primer Pocket and Flash-Hole Conditioning « Daily
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Fact Sheet 2012–3021: Devils Hole, NevadaA Primer
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PLUGS for Primer Hole in Head of 1936 - 1939 Knuckle & UL Motors
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How to Patch Nail & Screw Holes In Your Walls – Love & Renovations
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primer cratering The Stalking Directory
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Gorilla 16 Oz. Wall Repair Spackling & Primer - People's Lumber
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Primer Flash Hole Diameter & Black-Powder Cartridge Accuracy
3M™High Strength Small Hole Repair is an innovative lightweight compound that features primer enhanced spackle. The product offers great hiding power
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3M High Strength Small Hole Repair, Primer Enhanced, White, Interior Use, 32 oz.