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Old May 25, 2014, 09:05 PM   #16
SL1
Senior Member
 
Join Date: November 8, 2007
Posts: 2,001
BigJimP,

Do you always use the exact same bullets seated to the exact same depth in your handloads as was used to create the data you are using? If not, then you are not taking your own advice to "stay with the published recipe."

These days especially, people are subsituting bullets of the same weight, often without consideration of the effect that can have on seating depth and pressure. And, even when using the same bullet, many people adjust overall length to get the most reliable feeding in their guns, which also messes with seating depth and pressure.

So, it is really a good idea to consider seating depth when having issues with ejection or pressure signs, especially in 9mm, which is more "touchy" than most cartridges in that respect. And, with a really fast powder like Clays that reaches peak pressure before the bullet has moved as far as with the more commonly used slower powders, it is doubly touchy regarding seating depth.

SL1
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