The 6mm TCU was developed by Wes Ugalde of Fallon, Nevada for Thompson/Center as one of the chamberings for the Contender single shot pistol. It is the 223 Remington necked up to to 243 caliber and is practically identical to the older (1965) 6mm 223 Remington or the 6x45mm. The 6mm TCU is intended primarily as a metallic silhouette pistol cartridge, whereas the 6mm 223 Remington was developed as a rifle cartridge for benchrest and varmint shooting.
Necking the 223 Remington up to 6mm provides an advantage over the 22 caliber by reducing wind drift and, with heavier bullets, providing more energy down range. Also, 6mm cartridges in this class have a relatively mild report and less recoil than say, the 243 Winchester or 6mm Remington. T/C cautions against the use of military brass and recommends commercial 223 Remington brass for forming 6mm TCU cases. The 6mm TCU is adequate for small to medium varmints, but is on the light side for deer.
Source: Cartridges of the World
|6mm TCU Reloading Data|
|Bullet (grs.)||Powder / (grs.)||MV||ME||Source|
|60 HP||W-748 / 29.0||2610||905||14" barrel|
|70 HP||H-4895 / 26.0||2585||1045||14" barrel|
|80 HP||H-4895 / 25.0||2515||1065||14" barrel|
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