Can primers cause a light round?
I've had a few rounds that were light enough to not cycle the slide enough to pick up the next round.
In the last 3,000 rounds I would say I've had this happen 3 or 4 times and also had two bad primers that did not ignite.
I can only remember have a bad primer twice in 8 years(all Winchester).
I've been loading on this 550 for 8 years(500,000 rounds).
The load is 40 major, Titegroup, Winchester small pistol primers.
Powder drop looks consistent, primers are from the same box.