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The 6×45mm is a rimless, bottlenecked cartridge based on the .223 Remington or 5.56 NATO cartridge necked up to .243 (6mm). The cartridge is also known as the 6mm-223 Remington or 6mm/223.
I am selling a Black Hole Weaponry barrel chambered in 6x45 or sometimes called 6-223. Basically it is a 223 case neck sized to 6mm. It is fun to shoot and the bullet selection is not bad at all. This is a caliber you will need to load your own for. Load data can be found at www.hodgdon.com also...