I'll throw one more thing into the fire. Have a look at the Nosler laoding website and look at the case capacities of the 270 and 280 AI. About 1 grain.......

Which still makes me wonder how/why we see the 280 AI vels that get posted on here and on Noslers own website.

I love the 280 - had one since 1982. That gun was magic to me. I still fight not buying a 280 AI in a Montana even though I have a 270 that gets 2900+ with 150 Partitions......

Adversity doesn't build character, it reveals it.