250 .300 BLK Cases Shell Shock Technologies

T/C Accessories 17008207 Shock Wave Bonded Core 50 Cal Spire Point 250 GR 15

Winchester 300 Blackout 125 Grain Target Hollow Point - 20 Rounds

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Shell Shock Technologies - American Handgunner

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What are the advantages of 300 Blackout versus 5.56mm? I am considering buying a Springfield St. Victor 5.56 rifle but also like the 300 Blackout version. It seems that 5.56mm ammo is