Brass Sizing - some cases wont size

[Archon_g24]

No I haven't but I did read that some cases may become work hardend by repeated sizing and need to be annealed in order to set properly.

[fguffey]

Most of the cases size properly but there are a few cases that are long at the shoulder.

What would cause these cases to not take on the correct shape? Should I just scrap them and move on?

As the case is worked when fired and sized the ability of the case to resist sizing increases. Meaning; when the case increases in it's ability to resist sizing the presses' ability to overcome resistance must increase.

Then there should be a question asked; how does it do that? The presses ability is increased when the die is lowered the proverbial 1/4 turn after contact. After the 1/4 additional turn there is the additional 1/4 turn meaning the die is lowered .017" after contact first and if that does not work the reloader has the option of an additional 1//4 turn or .034"+.

At some point the reloader must give consideration to the fact their press could be flexing, I have seen presses flex .017" after the additional 1/2 turn after contact (that would be .051" flex). There are case lubes that simply do not look good when the going gets tuff.

When sizing a case I want my press to win, I do not want the case to whip one of my presses. For me it is easy to determine the winner, I use a feeler between the top pf the shell holder and bottom of the die with the ram at the top of the stroke.

F. Guffey

[pacrat]

[1] I'm just trying to size these back to match a factory new Nosler Trophy Grade round since I bought this lot used at a show and do not know the history.
[2]Once I fire them in my Springfield, I'll size them to match its chamber.

[1]Why bother intentionally overworking cases to meet specs of unfired factory cases when it serves no purpose?

Try them in your rifle with minimum resizing. If they fit, go straight to [2]

Personally, every lot of cases I get. Whether fired or new. First thing I do is run them through the rifle. If it goes into battery. I do not FL size. I neck size, load, shoot. Only after first firing do I worry about any consistancy issues.

JM2c

[fguffey]

[1]Why bother intentionally overworking cases to meet specs of unfired factory cases when it serves no purpose?

Try them in your rifle with minimum resizing. If they fit, go straight to [2]

Personally, every lot of cases I get. Whether fired or new. First thing I do is run them through the rifle. If it goes into battery. I do not FL size. I neck size, load, shoot. Only after first firing do I worry about any consistancy issues.

JM2c

If a reloader has a comparator or case gage why would they chamber a round in their chamber? A reloader should know the length of the chamber from the shoulder to the bolt face before sizing a case.

I have chamber gages, it is not likely a fired case from another chamber will fit the chamber gage.

A reloader should be able to sort case; I understand most believe sorting involves matching cases by head stamps. I sort cases by head stamp and by length from the shoulder to the case head. My favorite cases are cases that have been fired in trashy old chambers. I have purchased cases from shooting ranges that allowed me to sort cases by length. I do not need cases that fit, the difficult part involves lengthening the case from the shoulder to the case head.

And then there is that part about cases being difficult to size; I have fired cases that were difficult to size. The cases had a good reason for being difficult to size because I hammered them.

F. Guffey