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The heaviest and deepest penetrating 10mm in existence! Perfect for big game hunting and woods protection, this 21 brinell 230gr Hardcast Solid bullet (Wide Flat Nose Gas Check) will outperform all of the competition. This is the go to load when you absolutely need the DEEPEST penetrating bullet possible. The way this bullet was designed, it penetrates through soft tissue, heavy bone, and hide exceptionally well. The wide flat nose meplat cuts a large, clean hole without any flight deviation or deflection. Because they use 21 brinell lead to cast this bullet, it holds its shape well and will not deform on impact. In addition, they attach a gas check to the back of the 230gr Hardcast Solid. The gas check prevents powder burn from melting the lead and causing smearing/fouling in your barrel.