Bart,
I was thinking of the original Mauser designs. In my '96s and '98s, the ejector is fixed to the receiver and the case head doesn't find it until the bolt has extracted the case fully to the rear so it will clear the ejection port.
Metal God said:
If you ask me ( which nobody did ) using the word cartridge instead of case is wrong in many ways and is in fact confusing .
And yet, here's a brand fresh example in
Glen Zediker's Nov. 1 blog for Midsouth, where he says:
Glen Zediker said:
"Beyond {a} good caliper…there’s a very short list of measuring tools I will recommend as “must haves.” Top of that list is a cartridge headspace gage (which is used with that caliper)."
My point is that believing something is universally understood is an assumption. It's based on the idea other people hear the words the way you do. Yet, traveling to different parts of the country, you find usage isn't always universal. If a northern woman says "bless your heart", it means something completely different than it does coming out of the mouth of a southern lady. When I lived in Pittsburgh, I knew the meaning of the question, "'juns go to the store?" Most of the rest of the country doesn't recognize a truncation of the grammatically incorrect "did you ones", but in P-burgh, you do. Usage being regional is not unusual, and I'm starting to wonder if shooting forums qualify as a region, linguistically?
So the basis of my concern is unchanged. I can read "case headspace" or "cartridge headspace" to mean either a property of the case or cartridge, as you do, or as space in the chamber to accommodate a case or a cartridge, as the link I provided previously does. The only way I know to put a final nail in the coffin of that ambiguity is by employing a unique term that doesn't modify an existing term that means something different in a misinterpretable way.
Pwc,
You are correct the discussion has digressed. I don't think you can call it esoteric when most everyone seems to be aware of the terms, even if we aren't agreed on definitions, but it seems a bit nit-picky, I suppose, and wouldn't be worth bothering with except that we have to keep explaining it to newbies.
The original question was just about "bumping" shoulders, a term I believe has caused its own controversy as to whether or not a shoulder can be bumped because it then sounds like the shoulder exactly as-currently-constituted, is being moved back. My own take is the originators meant the case shoulder was bumped-into by the die shoulder, and that resulted in reconfiguring the case so a comparator gives you a thousandth or two lower numbers. I believe the term was originally applied to employing a special die made from a blank by your riflesmith and cut using the same reamer used to cut the chamber. A "bump die" thus configured did not narrow the case appreciably. Its shoulder just bumped into the case shoulder while the sides of the die merely ensured the resulting case still chambered. Thirty years ago, Precision Shooting had ads for the die blanks.
What are sold now as the bump dies, cannot possibly have those customized dimensions. So I thought I would call Forster and ask how their Bushing Bump Dies differ from other sizing dies. It turns out they are a bushing-type neck-sizing-only die, except they are cut it near the shoulder to match SAAMI minimum chamber dimensions. That way you can bump the die's shoulder into your case shoulder without spreading the lower corner of the shoulder beyond what will chamber. In other words, it forces the extra brass from extruding the shoulder back to flow into the neck and not radially outward. If you have a SAAMI maximum diameter chamber, I suppose your case might experience a slight squeeze when it gets to the to end of the die, but normal springback will keep that small and nothing like a normal FL resizing die would squeeze it.
If eliminating pressure ring stretching is your main interest, it is worth looking at
Varmint Al's site . He shows that even with full-length resizing, a highly polished chamber does not, as many fear, cause excessive bolt thrust,
and also shows that a polished chamber surface spreads out the portion of the brass over which stretching occurs. In other words, pressuring ring thinning is still there but becomes distributed over a half an inch or more of the case rather than focused over the short distance where the body departs the head, and that prevents the sharp thinning you normally get with a case sticking hard to the chamber wall.
Board member Slamfire has accomplished the same thing in the Garand by oiling cases to make them more slippery. You can FL resize and load them 20 times, and the sectioned case still doesn't show a distinct pressure ring location.