Rookie mistake

[Doom]

Interesting.

Which manufacturer and where?

Mysteries And Misconceptions Of The All-Important Primer - Shooting Times

By Allan Jones Most component primers have a little disk of paper between the

www.shootingtimes.com

 

[DShortt]

Mysteries And Misconceptions Of The All-Important Primer - Shooting Times

By Allan Jones Most component primers have a little disk of paper between the

www.shootingtimes.com

Thanks for sharing that.

 

[RegionRat]

Here is an important take-away from the article for those who won't open the link.



Not all primers have a standard anvil and cup design where the anvil feet stick up. The CCI BR primers arrive with the anvil feet flush to the bottom of the cup, so those are designed to have the cup flush to the bottom of the pocket. YMMV

 

[DShortt]

Here is an important take-away from the article for those who won't open the link.

View attachment 1730016

Not all primers have a standard anvil and cup design where the anvil feet stick up. The CCI BR primers arrive with the anvil feet flush to the bottom of the cup, so those are designed to have the cup flush to the bottom of the pocket. YMMV

Something else I noticed here. The primer needs to be seated to the bottom of the primer cup. I've seen discussions on this board where someone is trying to correct a FTF issue by messing with the primer seating depth. The primer needs to be all the way down to the base of the primer pocket at least. 'Floating' the primer above the base of the pocket is likely what caused the FTF in the first place in those situations.

 

[RegionRat]

Something else I noticed here. The primer needs to be seated to the bottom of the primer cup. I've seen discussions on this board where someone is trying to correct a FTF issue by messing with the primer seating depth. The primer needs to be all the way down to the base of the primer pocket at least. 'Floating' the primer above the base of the pocket is likely what caused the FTF in the first place in those situations.

Very often this is easy to diagnose, but other times it takes a while to dig up the root cause.

Ballistics is full of things with variation and tolerance stacking. When you consider the headspace, the bolt group, the brass pocket, the primer seating, etc., there can be lots of things to go right or wrong.

A strong ignition combined with tight ammo can sometimes make up for poorly seated primers for example.

The thing about primers and internal ballistics, is there is a very wide zone where things will work well, but there is also a very gradual zone of subtle problems that can go undetected before we have an obvious failure.

A FTF is obvious, but I have seen folks with everything from weak ignition and hang-fires to just poor groups, who don't even realize they are having the issues.

Priming cases isn't supposed to be controversial or require high workmanship skills but just sit back and watch how many issues come along. YMMV

Happy New Year!

 

[jpjulian]

I haven't cleaned a primer pocket in at least 20 years. Haven't de-burred a flash hole in at least the same time frame. Same for uniforming primer pockets. I was never able to see any improvement on target. If a process does not improve scores, it isn't worth doing. I no longer compete so that makes cleaning a primer pocket even less an issue for me...... ME.