Been reading posts about 45 ACP large vs small primers for a couple years. The major reason folks don't like them (besides plain ole stubborness) is they'll stop up a progressive press. Pre small primed 45ACPs some reloaders would just dump the cases in the auto case feeder without looking at them (don't know when they inspected their brass/ammo? when they were loading a magazine?). When a small primer pocket got mixed in with the large primer pockets it got fed a large primer the machine would stop and the operator would have to clear the malfunction.
I reload on a turret and I inspect
every case before it goes in my press so I don't have a problem w/small pistol primers in 45ACP!