I was apprehensive because the seller said it was a 35 Whelen AI. He had dies and fired brass that went with it. The dies said they were custom made dies, not AI dies. I figured the seller didn't know what he had and I was wondering what it was. I have a 375 AI and those 35 cases he had didn't look like 35 Whelen AI cases. I sort of figured it might be something like a 35 Gibbs. I also wasn't confident that the rifle would feed the ammo correctly. As it turned out all was fine.
I measured the cases when I got home and it is a Brown Whelen.

I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally