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For my 260 Remington,I resize 243 Winchester brass,and don't have any problems like you can get from down sizing 308 brass-Neck turning or shoulder donut.
You can resize 22-250 brass into 6.5 Creedmoor,and some guy's are resizing 250 Savage brass for it also.
I like both calibers,and the performance is almost identical between them.
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