Has anyone ever thought about a necked down 10mm cartridge? [Archive] - Glock Talk

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cbsaf
01-14-2010, 07:20
The .40S&W necked down to about a 9mm sized bullet makes the .357Sig which is a slightly hotter and faster round.

Has anyone done the same thing to a 10mm case? A .357 Glock magnum? Other than a barrel needing to be rechambered the rest of the gun should work if it could handle the stress and recoil.

Would anyone be interested in this?

IV Troop
01-14-2010, 07:26
It's been out there for years.

It is the 9x25 Dillon.

It is a screamer.

cbsaf
01-14-2010, 07:39
It's been out there for years.

It is the 9x25 Dillon.

It is a screamer.


Well.......I guess it was a good idea then. So good somebody already did it. Carry on then.

Jeager106
01-14-2010, 08:21
Actually the .357 Sig is NOT the .40 S&W necked down.
The .40 is too short to build a proper neck for the .355/.356 bullet.
The .357 Sig is really based on a .400 case that is slightly longer than the .40 S&W.
That is one of the reasons you can NOT run .40 S&W brass through a .357 Sig die and Get what we know at the .357 Sig.
Neck is too short.
If I'm wrong about that please correct me.
Thank you.
Anyone know where I can find info on the 9mm X 25mm rounds and are there handguns out there made for the Dillon round or must a pistol be a custom conversion job?

cbsaf
01-14-2010, 08:34
Actually the .357 Sig is NOT the .40 S&W necked down.
The .40 is too short to build a proper neck for the .355/.356 bullet.
The .357 Sig is really based on a .400 case that is slightly longer than the .40 S&W.
That is one of the reasons you can NOT run .40 S&W brass through a .357 Sig die and Get what we know at the .357 Sig.
Neck is too short.
If I'm wrong about that please correct me.
Thank you.
Anyone know where I can find info on the 9mm X 25mm rounds and are there handguns out there made for the Dillon round or must a pistol be a custom conversion job?


Well, the .357sig is "essentially" based off the .40S&W. The rear of the cartridge and overall length are similar enough to run in the same weapon with only a barrel swap. I understand the taper would require additional case length during the forming process.

A Wikipedia search of the 9x25 showed that only Doubletap makes a factory load for that round. All a G20 needs is the custom Lone Wolf barrel it would seem.

IV Troop
01-14-2010, 09:49
The 9x25 has some scary ballistics.

tango44
01-14-2010, 10:40
9x25 Dillon http://en.wikipedia.org/wiki/9x25_Dillon

ilgunguygt
01-14-2010, 10:44
Actually the .357 Sig is NOT the .40 S&W necked down.
The .40 is too short to build a proper neck for the .355/.356 bullet.
The .357 Sig is really based on a .400 case that is slightly longer than the .40 S&W.
That is one of the reasons you can NOT run .40 S&W brass through a .357 Sig die and Get what we know at the .357 Sig.
Neck is too short.
If I'm wrong about that please correct me.
Thank you.
Anyone know where I can find info on the 9mm X 25mm rounds and are there handguns out there made for the Dillon round or must a pistol be a custom conversion job?
Yes, you cannot neck down a 40 case to make it, but its still a .40 necked to a 9mm, as far as the description of it goes. You could in theory cut down a .30-06 case to make a 45acp, but it would not work either.

A simple barrel swap and any 10mm glock can do it. And let me tell you, I have shot "agressive" handloads chambered in it, and its damn impressive. Definately puts an end to the 9mm vs 45 debate.

fredj338
01-14-2010, 13:59
Yes, you cannot neck down a 40 case to make it, but its still a .40 necked to a 9mm, as far as the description of it goes. You could in theory cut down a .30-06 case to make a 45acp, but it would not work either.
Actually you can, just not recommended. When the 357ig first came out, many guys uused necked down 40s. The already short neck is even a few 1000ths shorter, but it does work, I just won't do it.

Catswold
01-15-2010, 18:13
The 9x25 has some scary ballistics.

Nah! Somebody should make a .44 mag necked down to .357...now that would be scarey.

Oops - .357 Bain-Davis (http://www.reloadbench.com/cartridges/w35744bd.html)

soulless
01-15-2010, 18:44
nice.. anyone tried it before?

fsqridah
01-15-2010, 20:48
Someone should take a .357 SIG case and neck it up to a 40-caliber. That would be pretty interesting...

2 Hawks
01-15-2010, 20:53
Someone should take a .357 SIG case and neck it up to a 40-caliber. That would be pretty interesting...

ALREADY BEEN DONE. I saw it first when some fool fire formed a 357Sig in his Glock 22..Came out a split .40..

grendelbane
01-16-2010, 13:02
I don't have a 9x25 Dillon. I do have a Gov't model with a 357 SIG barrel. I prefer to load my 357 SIGs to 1.265" to fit into a 10mm magazine. This is sort of in between the normal 357 SIG, and the 9x25 Dillon.

Kind of fun to shoot. Shoots real flat. Double the ft lbs energy of the .45 ACP. For anything serious, I would prefer the 9x23mm Winchester, though.