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You're probably going to have to have the barrel custom cut. I had never even heard of 6x45 until I Googled it to see what you were talking about. I appears that it's still in "wildcat" status.
6mm PPC may be easier to source.
__________________ "'Did you ever wonder why we had to run for shelter when the promise of a brave new world unfurled beneath a clear blue sky? "
Roger Waters