How does the lifespan of 10mm brass compare to .40sw brass?

[Oreo]

Just curious. Since I'm all set up for reloading the .40 now, I'm thinking that I'd like a G20 to compliment my G23. One advantage being that much of the reloading gear / components will work for both.

The only main issue is that 10mm brass can't be had for free at the range like the .40, so I'm going to have to buy it. To run the cost numbers it would be nice to know what it's typical lifespan is.

[freakshow10mm]

I'm working on 16 firings of hot ammo in my DT ammo brass (made by Starline). All loads have been over 200PF with this brass.

Just remember 10mm uses LARGE pistol primers, 40 uses small. I use CCI350 primers exclusively in 10mm. WLPs are ok but I like dedicated magnum primers.

[LexDiamonds]

The key is chamber support. With a stock G20 barrel, I would only run 1 or 2 warm loads thru new brass. I work up loads in my fullsize witness, which has excellent chamber support. I have ran a hot load of 10.0g Power Pistol with a 165gr JHP thru new brass for 5 loadings and it is in great shape. Will proabably bump this down to something midrange to extend life of the brass. Bottom line- with good case head support, 10mm acts like any good straight walled pistol cartride- load em' til they split.

[jwp]

problem is recovering brass
my loads[like doubletap] eject 35' from the gun with standard spring, a 20# one allows them to go 12-15 or so

[Bringsteen]

I get 15-20 reloads with Winchester brass as long as I only load target strength. In order to recover your brass, be sure to keep it polished. This makes it much easier to find. I also mark the heads of the loaded cartridges with a red Sharpie marker. This makes them still more conspicuous when I am hunting around for them.

[gokyo]

Get a Lone wolf barrel for great accuracy and chamber support.
Finding brass is easy.

http://i77.photobucket.com/albums/j42/gokyo/catch_all.jpg

Got mine at sportsmans warehouse for 20 bucks.

[Phunahm]

Get a Lone wolf barrel for great accuracy and chamber support.
Finding brass is easy.

http://i77.photobucket.com/albums/j42/gokyo/catch_all.jpg

Got mine at sportsmans warehouse for 20 bucks. I was think about that when I went to the indoor range Friday A guy saw me picking my brass up and asked if i was saving 40's or 45's I said any thing I can get so the remainder of the range time I collected about 300 - 400 cases and only 25 out of 100 of my 10mm :cryin: a lot of 9mm and 40's rounds I don't shoot but oh well I cant be choosy I guess...But was really considering that net as dorky as it looks its a money saver

[Clark]

A) I have one of those net with the plastic frame, but I don't care about retriving brass to reload it.

I am after the brass to look at it in powder increment work ups.

I now wrap a towel round the pistol and and my hand to catch the ejecting case.
This is far less work than removing the extractor.
But sometimes I get small burns on my hand from the hot case trapped against my skin by the towel.

B) Case life for rifles is when one of these things happen:
1) primer pocket gets loose
2) case mouth cracks
3) case head starts to separate
4) other

The 40 S&W will beat the 10mm case for case life with respect to the primer pocket getting loose.


The extractor groove on both a 40 S&W case and a 10mm case is ~ .337".

The LARGE primer pocket on a 10mm is .2100" inside diameter.
The SMALL primer pocket of a 40sw is .1745" inside diameter.

The extractor groove of .335" makes the brass case wall .0625" thick in the 10mm
The extractor groove of .335" makes the brass case wall .08025" thick in the 40sw
----------------------------------------
28.4% difference, advantage 40sw

If you can find a weaker case design for primer pocket strength than the 10mm, I want to know about it.

And don't say the 7.62x39mm Win Boxer Large primer brass.
That has an extractor groove of .372".

[VN350X10]

Because of the length/diameter ratio & the location of the CG, a lot of times a 10MM case will land & stand up, with the open end exposed, it's easy to miss them on the floor of an indoor range !
BUT....the nice thing about 10MM is that very few OTHER people will pick up your brass ! You will develop new techniques for crawling however.

uncle albert

[Shibumi]

A) I have one of those net with the plastic frame, but I don't care about retriving brass to reload it.

I am after the brass to look at it in powder increment work ups.

I now wrap a towel round the pistol and and my hand to catch the ejecting case.
This is far less work than removing the extractor.
But sometimes I get small burns on my hand from the hot case trapped against my skin by the towel.

B) Case life for rifles is when one of these things happen:
1) primer pocket gets loose
2) case mouth cracks
3) case head starts to separate
4) other

The 40 S&W will beat the 10mm case for case life with respect to the primer pocket getting loose.


The extractor groove on both a 40 S&W case and a 10mm case is ~ .337".

The LARGE primer pocket on a 10mm is .2100" inside diameter.
The SMALL primer pocket of a 40sw is .1745" inside diameter.

The extractor groove of .335" makes the brass case wall .0625" thick in the 10mm
The extractor groove of .335" makes the brass case wall .08025" thick in the 40sw
----------------------------------------
28.4% difference, advantage 40sw

If you can find a weaker case design for primer pocket strength than the 10mm, I want to know about it.

And don't say the 7.62x39mm Win Boxer Large primer brass.
That has an extractor groove of .372".


I can just imagine the tech at Winchester running into his bosses office-


"Boss, you know that new hot 10mm round that's getting popular?? I've figured a way to make those cases with EXACTLY the same amount of alloy a .40 uses by stretching the brass a little thinner! You can charge a lot more because it's bigger and nobody but those weirdo reloaders will know the difference! If one of them blows one up by reloading it the blame will be on THEM because everyone knows they're cheap and try to load them too many times or they goof up and double-charge a case..."


"Hmmm, you may have something there son..." :animlol:

[MakeMineaP99]

That situation occurs all too often, sadly.