This experiment investigates the impact of primer size and flash hole diameter on ignition reliability in .308 Winchester. Using Lapua brass with different primer and flash hole configurations, the test revealed that 'cooler' Sellier & Bellot small rifle primers combined with Hodgdon H335 powder and low case fill reliably induced hangfires, especially with small flash holes. Conversely, IMR 4895 showed consistent ignition across all setups, with small primer brass even yielding better accuracy.
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