Yep.
I avoid it, but do find myself sometimes wanting to break in a new firearm with factory ammo; or running old SD ammo through a new SD handgun for break-in (necessitating replacement with more factory SD ammo); or any number of other factors.
And I do use Remington Core-Lokt ammo as a 'baseline' for several cartridges. When your baseline is factory ammo... you have to buy factory ammo.
Case in point:
I'm working on a long-abandoned-and-neglected-but-soon-to-be-highly-customized '69 Marlin 336 (.30-30) right now, that includes a barrel chop from 20" to 16.25" (horrendous rust). The project is being documented on another forum, and I wanted a 'relatable' benchmark for other members/readers to be able to understand for the barrel chop, as well as the results after I fire-lap the barrel.
So, over 50% of the ammunition run through that rifle has been factory ammo. I actually bought another $45 worth of factory ammo last week, so that I can do the same thing with another .30-30 project (a '70 Glenfield Model 30).
I probably wouldn't have bought more factory ammo, if my newly-discovered .30-30 pet load hadn't turned out to have been using a discontinued (and unobtainable**) bullet. But, such is life...
I hate buying factory ammo, but in situations like that, I'll bite the bullet. No matter what, I still only buy ammo that I'm willing to hunt with. It's good for testing. It's good enough for hunting (if left over). And, no matter what, I have some brass to work with. (My .30-30 stash is pretty ridiculous, though... probably 1,300+ pieces.
)
**(The unobtainable bullet is the Speer Hot-Cor .308" 150 gr HCRN. It turned out to be an incredible performer in my testing. So, I went to order more... and quickly discovered that my 5+ year hiatus from the world of .30-30 had seen some changes...
---I can't put enough sad faces here to convey my disappointment at that time.
)