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Try sizing down and trimming 300 x .270 Win cases into .308 Win then!:D

When I neck down brass, I anneal the cases first. I then body size with a body die. Then I full size, more steps, but easier to do and less likely to stuff your F/L die by getting a stuck case.

I picked up some FNB 5.56 brass, now that was the worse I've ever seen. Flash holes and primer pockets not even in line with the brass.

I missed that bit, for a bolt action 7mm-08, you may have to neck turn the brass if necked down.

I use 7.62 x 51 brass, sorted by brand and year. The same as not mixing .308 by brand.
If you start from minimum powder load for developing any load, no worries.

As mentioned, removing the...