Resized some Weatherby 270 Weatherby brass to hold 6.5mm bullets? Do you think those bullets would ever touch down; or would they make it all the way around the earth and slap you in the rear?

McWhorters Rifles builds alot of them, but it is essentially the 264 Win Mag plus cool.

I have one and it is a hammer. i use 120 ttsx and 130tsx and 140 north fork tried bergers but not for hunting in my opinion. It shoots flat and hits hard. I shot a whitetail at 473 yards thru both shoulders with 140 NF and went through. Very accurate i neck up .257 weatherby brass but same difference

You are correct. It is less of a change to neck up .257 WBY brass than to neck down .270 WBY brass. No neck turning needed. Thanks for the information, gentleman.