This video details an advanced reloading experiment comparing the impact of different sizing dies on cartridge runout and accuracy for the .223 Remington caliber. The instructor meticulously tests Lee, Redding, and Mighty Armory dies, along with various expander types, to quantify their effect on concentricity. The results are then correlated with 10-shot group performance at 100 yards, revealing surprising insights into how die choice can influence precision, while also highlighting the potential impact of barrel heat on group consistency.
This guide details a comparative analysis of Forster, Lee Precision, and RCBS sizing dies for 300 Blackout ammunition, as presented by Johnny of Johnny's Reloading Bench. The expert-level instruction focuses on identifying dies that provide optimal neck tension and prevent bullet setback, crucial for both accuracy and feeding reliability. The process involves meticulous measurement of expander balls, case stretch, and headspace, followed by live-fire testing to evaluate accuracy and velocity.
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