Maybe a stupid question
- Thread starter DGY
- Start date
brenden270
CGN Regular
- Location
- Kootenays BC
Are you measuring with a primer still in?
The kicker is that there are a lot of chambers that are a bit longer than the SAAMI spec. Stick in a bore scope and you see a gap between the end of the brass and the end of the neck section of the chamber. Sinclair makes a cool little stub that fits in a pc of shortened brass. Insert the brass in the chamber and close the bolt. This pushes the stub into the brass and you can now measure the actual chamber length.
So, you're saying you trim your 9.3x62 brass to 2.431" [0.010" less than max case length = 2.441"], but after firing & then re-sizing, they measure 2.445"?
I'd suggest that your expander button, or perhaps your brass, or dies, may be to blame; if not, as others have suggested, you may have an over-long chamber, but I'd be skeptical of that in a new CZ chamber.
How long are your cases after firing, but before sizing?
Hornady brass, by any chance?
I'd suggest that your expander button, or perhaps your brass, or dies, may be to blame; if not, as others have suggested, you may have an over-long chamber, but I'd be skeptical of that in a new CZ chamber.
How long are your cases after firing, but before sizing?
Hornady brass, by any chance?
Generally I have found the chamber to be about .030" longer than "max chamber length"
Dogleg has the answer. Adjust the sizing die to bump the shoulder back just enough so the cartridge chambers reliably. Pushing the shoulder back more than needed will cause the case to stretch when fired, and reduce case life.
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- Location
- Western Manitoba
I do not know the lengths or actually measure cases that I trim, but they get run through the system for every re-load. Some years ago, I started with the LEE case trim system - a spinner stud to go in an electric drill and a cutter is one purchase - same thing used for any cartridge. Then a specific length gauge and shell holder for a specific cartridge. I still roll the cases on a "lube pad" that gets soaked with RCBS Case-Lube 2 - which is apparently water based. It has become my habit to take each brass from the full length sizing die - even new brass - chuck it onto that spinner stud - trim case to whatever length Lee makes the stem - sometimes I just get "angel hair", sometimes only one side gets trimmed, sometimes it gets a good bite - then chamfer inside and out, then use damp rag to wipe off the lube - on to next case. I tend these days to do that case prep as one step - another session is to prime and dispense powder and seat bullet. The picture below should show the kit. There must be three or four spinner studs and cutters here - one case length gauge and shell holder for each cartridge that I reload - and only that one chamfering tool - on the side of that chamfering tool is stamped "Made for RCBS by L.E. Wilson".
EDIT: - as might be surmised from my description, I have never reloaded handgun rounds - the above is what I do for centre-fire rifle rounds.
EDIT: - as might be surmised from my description, I have never reloaded handgun rounds - the above is what I do for centre-fire rifle rounds.
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