Every online source of once-fired brass that I've checked has been warning that they're not going to sort out the small primers.
Once I had collected about 20 from the range, I went ahead and bought enough once-fired to bring my total of small primer up to something worth loading.
After cleaning I run a colored marker across the heads to help keep them separate. I figure it also makes it more likely that anybody picking up my strays at the range will at least look at the head before throwing it into a progressive press.
One of my pistols has a fairly light trigger spring and I find that Federal small primers are the only thing that are 100% reliable