Re: 264 win mag vs. 6.5x284
I do like Lapua brass & use it in some cartridges, but Nosler makes 264 mag brass, so you can get good brass, though maybe not the very best.
I can't tell what you are going to do with it, for volume shooting the 6.5x284 wins, but a 260 or CM would be better for that.
For occasional long range shots on Elk sized game I would want the extra vel. & resultant terminal effect of the .264.
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