Primers have changed over the years and probably because of the consumer.
When I first heard of this problem It was a bulletin from CCI that recommended that
due to the softer cups of there primers (For better ignition) that they not be used in a hand
Priming tool that held more than one primer.
This was from CCI and I used/use a lot of CCI primers so I quit using my hand priming tool
And never had a problem.
Federal has always been known for thicker cups on there primers so they must have changed
To a softer/thiner cup if this is a problem.
In my opinion if it has happened more than once then it is problem that should be avoided
For safety reasons no mater what type of primer you are using.
There are plenty of good tools for priming and the risk is just not worth the convenience.
Also pistol primers are different than rifle primers so softer/thiner cups (Lower pressures)
they would be even more likely to cause a problem.
J E CUSTOM