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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Extreeme spread and tight groups
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<blockquote data-quote="ktg" data-source="post: 29995" data-attributes="member: 764"><p>308175, new prepped cases should size the same. If you have a case that has been fired many times, it may have different 'hardness' from work hardening than other pieces of you have. This can cause the actual neck diameter of the sized brass to be different from each other, causing neck tension to vary. The only way to know is to measure the neck diameter after sizing. I had brass that the sized neck diameters varied by nearly .002". After annealing, they varied by about .0003". You should be able to find info on the process by doing a search.</p></blockquote><p></p>
[QUOTE="ktg, post: 29995, member: 764"] 308175, new prepped cases should size the same. If you have a case that has been fired many times, it may have different 'hardness' from work hardening than other pieces of you have. This can cause the actual neck diameter of the sized brass to be different from each other, causing neck tension to vary. The only way to know is to measure the neck diameter after sizing. I had brass that the sized neck diameters varied by nearly .002". After annealing, they varied by about .0003". You should be able to find info on the process by doing a search. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Extreeme spread and tight groups
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