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Rifles, Reloading, Optics, Equipment
Reloading
FL sizing shoulder bump question
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<blockquote data-quote="el matador" data-source="post: 1839814" data-attributes="member: 12193"><p>Having firm contact with the shell holder ensures that each case will be sized exactly the same amount. Apparently Whidden doesn't think this is necessary and they're not the only ones. A reloading press is made of steel and iron which are elastic materials. It will flex. So if one case requires more force its going to deflect the press more. My opinion is that with small cases like 308 its not much of an issue. Sizing 300 Win, 338 Lapua, or the fatter WSM cases tends to place a lot more load on the press. If your case lube isn't consistent, or if you're resizing brass from a pressure test and they've expanded differently, you will have variations in your sizing. It can easily be .003" or more in these situations. So if you're trying for a .002" shoulder bump it could be a problem. Redding makes the competition shell holders for this very reason. Shimming the shell holder can also be effective. Since you're sizing a fairly small case and you have the tools to measure I'd just compare a bunch of sized brass. If they're consistent then you're good to go.</p></blockquote><p></p>
[QUOTE="el matador, post: 1839814, member: 12193"] Having firm contact with the shell holder ensures that each case will be sized exactly the same amount. Apparently Whidden doesn't think this is necessary and they're not the only ones. A reloading press is made of steel and iron which are elastic materials. It will flex. So if one case requires more force its going to deflect the press more. My opinion is that with small cases like 308 its not much of an issue. Sizing 300 Win, 338 Lapua, or the fatter WSM cases tends to place a lot more load on the press. If your case lube isn't consistent, or if you're resizing brass from a pressure test and they've expanded differently, you will have variations in your sizing. It can easily be .003" or more in these situations. So if you're trying for a .002" shoulder bump it could be a problem. Redding makes the competition shell holders for this very reason. Shimming the shell holder can also be effective. Since you're sizing a fairly small case and you have the tools to measure I'd just compare a bunch of sized brass. If they're consistent then you're good to go. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
FL sizing shoulder bump question
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