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How to Avoid Crushing Bottleneck Rifle Cases When Sizing | “Quick Tips” Episode #10 | Starline Brass


When sizing bottleneck rifle cases, especially
shorter length and thin walled cases like the .32-20, or .25-20 it is possible to crush the case
if the expander is improperly adjusted. Most bottleneck sizing dies will have a case
mouth expander on the decapping assembly. This expander is used to set the ID of the
mouth to achieve the proper bullet tension. The sizing die will size the case neck down
enough that the ID is smaller than expander, meaning that if the expander is in the neck
area of the die, there will not be enough clearance for the case walls and you will
crush the case. The expander needs to be set below the neck area of the die, making sure that it is not set too low hitting the bottom of the case, as you could damage the primer pocket. That is why this isn’t usually a problem with longer cases because when the expander/decapping assembly is set low enough to decap, the expander
is set well below the neck in the die. Crushing bottleneck rifle cases while sizing

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