Just what the title says, rcbs rockchucker, lee 308 full length sizing die. The shoulders are being set back 2 thou but the case mouth diameter is stil .312 or more. What am i doing wrong?
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Sizing die setting shoulder back but not sizing case mouth
- Thread starter Guthrie
- Start date
ID or OD of the mouth?
.312 inside. Its like a fired case.
And this die resized the ID properly in the past?
Also measure the OD
Yes sir it did. The same brass that wont size right now.
Are you using a decapping stem with neck expander?
If the die worked previously as hardened steel, unlikely to have worn to the point it’s out of disc now. Since the sizing is on the OD only, the ID Is contingent on uniform wall thickness. OD-wall thickness=ID which leads me to suspect wall thinning may be the culprit here. Bit hard to measure with just calipers, a micrometer would be better but try to measure wall thickness at a few places on a couple different cases.
Im not i mandrel size.
These cases do have a couple thousandths neck turned off of them but i wouldnt think that would cause it not close the case mouth. Just to reiterate, its bumping the shoulder back but not closing the case mouth.
