Research
When you go to a store and buy ammo, which of the following options best describes your experience?
a) I went to a store and bought ammo
b) I didn't go to a store and buy ammo, it fell out of the side of a big blue machine in my shop
In my experience, going to a store and buying ammo is almost always better described by option A than option B. So if you find someone describing option B, then in my opinion, they are probably not describing going to a store and buying ammo.
Now let's look at a slightly different scenario:
Which of the following best describes making your own ammo?
a) It falls out of the side of a big blue machine in my shop
b) I went to a store and bought some ammo
Again there is a slight but definite trend towards buying factory ammo being more like buying factory ammo than like reloading, and in a possibly related trend, reloading is generally found to be more like reloading than it is like driving to a store and buying some ammo.
Conclusions
If someone talks about the incredibly inexpensive ammunition that falls out of the side of a big blue machine that they have in their shop, we believe that the probability is high that the subject is talking about ammunitions they have made with that machine.