Scene from the range

Guy comes in near closing, leans on the counter, looks at the bullets for a minute(bullets for reloading, not ammo), finally says "Do you have any .700 Nitro Express?"
"No sir."
"Any .600 Nitro Express?"
"No sir.  Those are specialty ammo, you're going to have to order it."
"Any .500?"
"No, same thing, it's specialty you'll have to order."
"Would anyone else have any?"
"No.  Again, specialty ammo, you'll have to order it."
Moment of thought.
"Do you have any .45-70?"
"Usually."
"Is that a bolt action?"
"No, usually a lever-action or single-shot."
"Where are those?
"If we have any, in the rifle sales over there."
And off he went.  

No, I have no idea.  And I'm not sure if I want to.