I don't have much experience in the 6mm game...yet. The 6x45 is based on the 223 remington necked up 6mm. The 6x47 is based on the 6.5x47 lapua necked down to 6mm. The 6x47 is going to have much more power than the 6x45. I would place the 6x47 close in power to the 243 winchester cartridge.
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