I buy as needed, and drawers in the Kennedy box get filled accordingly.
And
I buy matching die reamers for "most" applications.
"Most" customers will purchase their own dies for their own reasons, with their own money, and it's not your circus, not your monkey, and be glad of it.
However, down the road, someone will want a chamber you've already cut several times, and isn't a sub MOA guy, that just wants to shoot and doesn't mind reloading. Die blanks are relatively inexpensive. Two sales for the price of one. No circus, happy monkey.
And yes , SAAMI specification is the overwhelming majority.
BTW, when a customer specifies his own reamer dimensions have them order the reamer direct from the supplier. No monkeying around.
And if a customer insists on a virgin reamer, same thing.
If this mutt thinks so little of me to think I'd chamber his rifle with a dull reamer* he can monkey around with somebody else's monkey.
No one needs that customer so badly that it's worth being being married to his rifle for life. Believe me the two go hand in hand.
This one will break a firing pin years later and blame the loss of a trophy monkey as well as the cost of the entire hunt on YOU.
Not on the multitude of times the weapon was dry fired w/o snap cap while larping in the mirror as the great white hunter.
Jaded much? Ubetcha.
*I have had a reamer quit in the middle of a job and had to overnight one at my cost. I got a significant piece of the first Elk that rifle took.
Different kind of monkey and no circus ;-)