If you are using a redding body die you can compress the shoulder below SAAMI, then the short cartridge will move forward when the trigger is pulled, and you get what seems like light primer strikes, but it’s really you have too much headspace and the brass is moving forward.
I’ve seen brass 10 thousands too short cause this personally.
Make sure you know how to adjust your dies if you decide to bump your shoulders.
The first time you “over bump” ... and get around 10 thousands to far - you will get light prime strikes ... click with no bang = no joy.
You won’t forget doing it wrong though...
Not sure I understand this. Bump the shoulder to far and get light primer strike's? You can only bump the shoulder so far and you return the case to SAMMI min spec! You get light primer strike's there and I'd guess your chamber has excessive head space. Then either get it fixed or learn to size the case to fit your chamber. That get's back to partial sizing, aka bumping the shoulder.
