When I started rebarreling Lugers for my needs/wants, I went out to SAAMI to see the numbers on the 9mm and 30 Luger. The go and no go limits on one was over 20, the other was 10. Always thought that was a little odd, but not much influence as I was taught to stay at go or go plus some(some is a relative term I know, but depends on environment)
I have noticed a lot of 9mmx19 range brass being short of the 745 9mm SAMMI number, but guess that they are interested mainly in one time compatibility. The reloaders are a small market comparatively.
In coming up thru the ranks of hard knocks, I have come to kinda like when things are intended to work together. When the chambers are cut appropriately, the sized case is long enough, overall length is there, and the pressure is semi-sane, whether factory whatever or handloads, the pistol is a joy to shoot, no muss; no fuss; just an enjoyable experience; just works.
My thanks to Mark for his comments on the tighter spec.
I learned under some benchresters, fussy types, knowledgeable. Not seen two guy argue over 2 thousandths of length for hours on end before, but just their nature. Cannot say too much against their successes. All in all, everything has its place....and time. One has to ponder a lot of things in life and see what works for them.
The 20 in the 9mm spec is almost half of the firing pin total protrusion in some things, so one thinks things could get dicey in ignition if nothing else.
Rimfire is mostly done with the rim. Lots of available vendor dimensions there, some in the mid 30's on rim to mid 40's on the rim, so a victim of circumstance as Curly would say about finding the right 22 ammo for the right rifle/chamber.
One notes in rimmed with cases with shoulders, like the 22 hornet or its wildcats, headspacing on the rim becomes a search for the right lot of ammo with reloading intents. The sharper shoulder of a hornet wildcat seems more flexible and works with the reloader type.
I have a Ruger No.1 mule as I call it; maybe 10 barrels for it. It has been everything from a 17 bumble bee to a 375 H&H. Being a packrat, I still have all the barrels, so one can screw on the barrel, check the index mark, and the extractor number.............and go shooting. These are threaded actions of course. The actions like Savage, and the rimfires, are pretty flexible as to headspace and even gapspace, and take the extra tooling.
The clowns that I know that do custom chambering, know exactly what the headspace is going to be after torquing down, they measured it with a nice depth mic on the action and holding feature face. They use gages to double check their work and for liability requirements. Odd one can measure to a tenth, but use of a simple gage trumps all in some circles. Then there are the guys that use no gages, because their cartridges are not on the list............but I have a nightie that they know how. Obviously there are guys that gunsmith beyond their capabilities as well.......The more knowledge an individual has, the more clear some things become.
I do not know if SAAMI updates old cartridge info with current manufacturing. I would doubt if the establishment moves much. The 35 Winchester Legend was just added as a new case recently.
I think everyone is on the same basic page. Be safe and likes performance.
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