7 Saum bushing

I've used hornady and I had to place an order with short action customs so I picked up a bushing for a couple rifles from them
I'd guess he means what size.
Usually just measure a loaded round (or neckthickness x2 + bullet diameter) and take .002" off.

But since you are posting on the internet I'm guessing you are waiting on the brass still. If not one here can answer your question I've messaged ADG in the past to ask what the neck thickness of brass was.
 

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