Pass through sizing

[REDLINE]

Maybe I'm off base here, but I don't believe SAAMI specs are limited to a minimum dimension, I think SAAMI gives a range of measurement that anything applicable should fall within.

[DM1906]

Maybe I'm off base here, but I don't believe SAAMI specs are limited to a minimum dimension, I think SAAMI gives a range of measurement that anything applicable should fall within.

Actually, they do, depending on the spec.  Chamber or cartridge.  Maximum cartridge dimension vs. minimum chamber dimension (within the acceptable tolerance).  This is what allows a firearm mfg. to release a gun that will chamber any commercially produced ammo of the same caliber.  If the chamber and cartridge dimensions crossed over at any point, we'd have ammo that didn't fit, at some point.

[REDLINE]

A minimum and maximum are given for headspace;  0.992"-1.004"

http://saami.org/PubResources/CC_Drawings/Pistol/10mm%20Automatic.pdf

[gator378]

............

DM1906, Im not making this statement as a jab or dig on your statement, mearly stating facts here...
Cartridge Gauge is not the same as a barrel's chamber period!  As a matter of fact most chambers are cut larger than this spec for more reliable feeding.  But the gauge helps to insure that the ammo will be at a spec where it will fit any chamber, including the tightest ones.

I didn't say it was the same as a barrel's chamber.  I said, "A cartridge gage is only a chamber without a barrel [a rough description], most often sized to the SAAMI chamber spec.".  Most firearm chambers are quite larger than the SAAMI spec for chambers in some respects (Glock is a prime example), which is a minimum dimensional measurement, with a +/- of a specific value.  Unless your gages are custom, or really poor quality, they should be SAAMI spec.  SAAMI cartridge specs. are quite the opposite.  This is done to ensure that every mfg, be they firearm mfg's or cartridge mfg's, produce products that will work with one another, universally.  This is why I suggest not using the FCD for case sizing, which sizes more closely to the chamber dimension, rather than the cartridge dimension.  This affects case volume and combustion pressure.  It also introduces inconsistencies.  Your use may be unique, and you have the experience to make that determination.  My response only applies to those who may not know, or don't have the experience they should have to know.  Case gages for straight wall cases are essentially an unnecessary expense.  Dimensional measurements are very simple, and only involve two values, 3 at most (if a taper is involved, such as 9mm Luger).  Shouldered cases are different, and a gage should be used if loading for multiple chambers, or recoil operated actions (.357 Sig, for example), to ensure proper head spacing.

I guess my Redding Dies and Barstow barrel is the ticket.  None of these reloading problems for about 10 years.  Reload, lots of AA #9, Barstow barrel, bang, no problems, no smileys. IMO Glock barrels are junk.

[The_Shadow]

I never had any issues with my own handloaded ammo over the years due mostly impart to great chamber support, however I purchased and traded for some 10mm brass said to be range pick up.  Many were shot from Glocks, some were fired in the MP-5 10mm's and the case expansion was lower than most standard reloading dies would reach to recondition them to fit the tighter tolleranced barrel chambers.

The "Pass-Thru" system has been a great way to recondition them for reliable re-use, it also helped remove the marks left by the fluted chambers of those MP-5's.  Pricing is an issue buying used 10mm brass, most want too much for it!  I try to buy at half the price of new brass ($70 per 1K including shipping!) is where I make or break a deal!

[sqlbullet]

Same for me.  I am always shocked when I see 10mm brass in the paper for $15/100.  Don't people realize that is new brass pricing?

[REDLINE]

Sometimes the process of supply-and-demand sucks.