6mm is a great round. It's also known as the .244 Rem. So you may want to look for brass so stamped.
Necking down from 8x57/.323, 7x57, /.284, .257 Roberts/.257 to 6mm/.243 will definitely require trimming and turning the necks. The larger the case mouth, the more work will be required. If possible, I'd look for .257Roberts brass, if I could find it.
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Last edited by CH4; 10-02-2023 at 12:20 PM.
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