Much as I appreciate the Lyman 310 dies I must admit that I don't often prime using the 310 priming chamber but today I couldn't locate either the small pin for my RCBS APS strip loader or the #20 shell holder for my Lee hand primer so I decided to use the #4 priming chamber. I discovered that the drive pin of the #4 PC is too large to pass through either the #4 adapter in my aluminum 310 handles or the steel .22 Hornet handles!
I certainly need to organize my shop better so I can find these small parts when I need them, one of the hazards of spending time in two different locations for much of the year, dividing time between Florida and North Carolina, what I need is often in the other location! But I cannot understand how the drive pin of the correct #4 PC doesn't clear the #4 adapter or a set of steel .22 Hornet handles. I pretty much learn something new every time I use these 310 dies!