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I went down the custom 243 path, 1:8 twist trueflite barrel still in a short action, I do load out long to the max i can fit in the magazine with 108gr pills.
I'm not running hot over book charge...

For shooting steel/target from 500-1000 mtr.
The 6mm's are very popular in US, either 243 with fast twist barrel or 6mmCM but you would have to reload as not a lot of 103 - 115gr long range factory...