Z-RAM Z.68v2 vs Z.68v3: Version Names and Umarex HDR68/TR68 Context
Z.68v2 and Z.68v3 are separate versions within Z-RAM's .68 projectile family. The earlier presentation explains the rounded-side 8.5 g v2 design; the v3 introduction highlights side grooves and the Umarex HDR68/TR68 context.
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