It is a 30 caliber neck. I'm thinking 30-30 Ackley AI is correct. It mics out to slightly over on all dimensions, after being fired that would be about right.
They were tumbled, sitting on a shelf above my cleaning table in my garage. That means I got them in the last 6 months. I don't shoot 30-30 so I would generally remember someone handing them to me.
I've left a message with the person I think they came from to see if she has any fired cases from her Model 94 to see if hers is rechambered.