Mother load! Old Cor-Bon 135's, Winchester Silvertips

Intercooler · November 27 2013 03:14:46 PM MST

Purchased a decent lot of ammo recently and it showed up today. An older gentleman passed away and his friend purchased his ammo which contained 10mm. I bought those from him and they will for sure be used to learn and feed all my 10's ${$default_cool_smiley}$ which I am sure is the way he would want it. Supposedly the original owner had the most expensive equipment and pistols money could buy. When checking out the WSF reloads I couldn't see any extractor marks or ejector marks, making me think he was using a revolver such as a 610.

Older Cor-Bon 135gr JHP 1400 FPS rating box of 20. The new boxes are different.

Older Winchester 175gr Silvertips. Looks like from ~2001

Old style Winchester Silvertip tray

The foam packaging really kept the brass nice. Most Winchester brass turns ugly quickly!

Old Cor-Bon 135gr JHP rated 1450 FPS. That's odd and a box of 50 no less!

Winchester Nickel plated 10mm brass. Pretty rare I think!

Midway 10mm headstamped brass. Wonder if they still carry it?

The_Shadow · November 27 2013 03:25:56 PM MST

They look like they have been stored well and in great shape...You done good! Congrats! ${$default_cool_smiley}$

Intercooler · November 27 2013 03:43:46 PM MST

I did real well! I pulled out a sampling of the reloads for verification but they all look good.

Wonder why Cor-Bon has one 135@1400 FPS and another at 1450 FPS? Is it worth Chronographing or pulling down the Silvertips?

MCQUADE · November 27 2013 03:47:38 PM MST

Nice score!!

Intercooler · November 27 2013 03:50:50 PM MST

I feel like I stole it ${$default_embarrassed_smiley}$ $110 for all that ${$default_smiley_smiley}$

MCQUADE · November 27 2013 04:31:32 PM MST

I wouldn't post that, people will think less of you ${$default_shocked_smiley}$

Intercooler · November 27 2013 04:35:04 PM MST

Ooops!

The target rounds will come in real handy. I like paper punching with something a little more tame.

The_Shadow · November 27 2013 06:06:36 PM MST

The Winchester SilverTips the powders will be unknown non-canister proprietary. ${$default_huh_smiley}$ If we did a pull-down we will likely see what we already did, even though it may be a different charge weight.

CorBon, could have used slightly different recipes for the numbers shown... $:-\$ You could measure the Cartridge Overall Length to see if they used different seating depths.

The handloads could be anywhere from powder drop measure to Match Grade loads, depending on his equipment and attention to details. The data seemed to allow some room for fluctuations. ${$default_wink_smiley}$

blastfact · November 27 2013 08:28:01 PM MST

I would safety check some of the ammo load wise. Then enjoy the blast fest!

But over all I don't see any real value in 10mm ammo lighter than 155gn. Yeah it goes fast! But my study has shown me a 125gn .357mag is far better than 135gn 10mm. Something about SD coming into to play. ${$default_cool_smiley}$ 155gn and up bullets is where the .357mag falls off against 10mm regardless of barrel length.

Enjoy the ammo that may have come from a past master. It has all sorts of cool attached to it. ${$default_smiley_smiley}$

4949shooter · November 28 2013 04:27:45 AM MST

124 "granos" Lol..

I would be curious to see how that older silvertip charge compares to the modern Silvertip charges.

I bet Corbon lowered their 10mm velocity from 1450 to 1400 just like all the other ammo manufacturers.

Intercooler · November 28 2013 06:43:03 AM MST

I'm sending a sampling of the FMJ's to The Shadow for pull-downs. Based on what is there I plan to hand weigh every round placing a stamp of approval on every box before shooting. I might send one of the Silvertips down as well but just get it back instead of shooting.

Some ammo gives results we wouldn't expect! The little 100gr Pow'RBall 9mm round amazed me!

13.1" penetration with expansion of .587" and 99% retained weight ${$default_grin_smiley}$

Intercooler · November 28 2013 08:42:15 AM MST

Here is a twist. I think the new Cor-Bon 135's:

Are different than even the two old ones I am about to test Saturday ${$default_shocked_smiley}$

enidpd804 · November 28 2013 09:37:34 AM MST

Quote from: 4949shooter on November 28 2013 04:27:45 AM MST
124 "granos" Lol..

I bet Corbon lowered their 10mm velocity from 1450 to 1400 just like all the other ammo manufacturers.

f

I read an article a few decades ago that SAAMI was lowering pressures on both the .357 and 10mm. The magnum 125 grain rounds went down to 1400 fps from 1450 and likewise the 10mm 135's.

The_Shadow · November 28 2013 09:54:44 AM MST

A lot of what went on, was the change over to the piezoelectric transducer (PSI) from the copper crusher (C.U.P.) methods.
10mm was developed about that time frame of this transition when SAAMI established the 37,500 PSI MAP.
More info can be found here about the SAAMI MAP - http://10mm-firearms.com/factory-10mm-ammo/10mm-ammo-history/

HammersD · November 28 2013 10:33:08 AM MST

Very nice Intercooler. ${$default_smiley_smiley}$ will be patiently awaiting the pull downs from Shadow.