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Shooting & Reloading - Mausers, Big Bores and others >> Rifles

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pinotguy
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Reged: 03/02/07
Posts: 57
Loc: CO
7x66 Vom Hofe Super Express.
      #73139 - 05/03/07 03:32 AM

Can anyone provide any insight regarding this cartridge? It sure appears as though it's well-designed with high-performance. At this point in time though, is it considered too obsolete to try and pursue as a project? I have not come across a source for factory ammo which leads me to believe that it has become an extinct caliber.

Thanks in advance.


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500Nitro
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Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73155 - 05/03/07 07:02 AM


pinotguy

I also liked the look of the cartridge.

The only ?best? source of info I have on it is from CARTRIDGES OF THE WORLD.

If you are looking for more info, I would suggest looking in Europe and at the European Ammo Manufacturers.

Hope this helps.


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Mike_McGuire
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Reged: 11/06/05
Posts: 348
Loc: Sydney Australia
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73161 - 05/03/07 08:36 AM

I don't have CARTRIDGES OF THE WORLD of the world here (the lend and never get back priniple ) but from memory the 7x66 Vom Hofe Super Express was a 404 Jeffery size case but shortened back to about 300 Win length and with more taper than calibres like the current belted magnums and RUMs.

The old handloading book by Phil Sharpe had quite a bit on the older "hot" European calibres.Actually Phil Sharpes book isa agood read as it was written at a time when Wbys were wildcat status and calibres such as the 375 H&H were fairly new on the scene in America and were seen as real cannons. Some of the early Wby claims for ballistics were way over the top

Mike


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AzGuy
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Reged: 23/03/06
Posts: 388
Loc: Prescott, Arizona, USA
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73162 - 05/03/07 09:43 AM

It is not extinct, but probably on the endangered species list. The original factory ballistics were wildly optimistic and even those were derived from 28-30 inch barrels. If you want something really unigue...go for it!! But I think you would be much better off with any of the current 7mm's.

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pinotguy
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Reged: 03/02/07
Posts: 57
Loc: CO
Re: 7x66 Vom Hofe Super Express. [Re: AzGuy]
      #73177 - 05/03/07 12:41 PM

Well after doing some further research, I've discovered that 7x66 Vom Hofe is not completely dead, but as AZ noted, it is on its last legs - at least here in the U.S. I found brass at Huntington's, which is the key as 7mm bullets are easily found. Supposedly, Walter Gehmann still manufactures factory ammunition but I'm highly skeptical that any of it finds its way into the U.S.

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wellplugger
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Reged: 03/11/06
Posts: 45
Loc: So. East Texas
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73303 - 07/03/07 06:37 AM

You might check out P.O. Ackley's book for shooter's and handloaders. I seem to remember this cartridge being listed with loading data as well. Good luck in your search.......Lee

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500Nitro
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Reged: 06/01/03
Posts: 7244
Loc: Victoria, Australia
Re: 7x66 Vom Hofe Super Express. [Re: wellplugger]
      #73305 - 07/03/07 07:00 AM


There are quite a few cartridges that have found no favour
in the US but are the standard chamberings in Europe, both in guns and by Ammunition Manufacturers.

2 that have made the transition are the 9.3 x 62mm and the 9.3 x 74R.


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Paatti
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Reged: 18/01/07
Posts: 301
Loc: Finland
Re: 7x66 Vom Hofe Super Express. [Re: wellplugger]
      #73308 - 07/03/07 07:15 AM

Some information
Developed in 1955 by firma Gehmann and only named after Vom Hofe. Shoulder is something between round Weatherby and normal shoulder.
160gr Sierra ts / Vihtavuori N160 69,0gr / 3800bar

Nowdays 8x68s or 6,5x68 could be more easier and do the same job.


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NitroXAdministrator
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Reged: 25/12/02
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Re: 7x66 Vom Hofe Super Express. [Re: Paatti]
      #73318 - 07/03/07 12:27 PM

There was a article in the Hatati Times where a historical German hunter made the 7mm Super Express Vom Hofe his main medium calibre rifle. Along with a .500 NE double and ... ?

--------------------
John aka NitroX

...
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"


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DPhillips
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Reged: 09/10/03
Posts: 819
Loc: Alaska
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73337 - 07/03/07 07:03 PM

Quote:

Can anyone provide any insight regarding this cartridge? It sure appears as though it's well-designed with high-performance. At this point in time though, is it considered too obsolete to try and pursue as a project? I have not come across a source for factory ammo which leads me to believe that it has become an extinct caliber.

Thanks in advance.







Huntington's is importing some brass from Gehmann's now. The images of the 7x66 I posted have Gehmann brass. I'm getting my 7x75R Vom Hofe Super Express brass and got my dies (RCBS) from Huntington's. The brass was made by Gehmann. So, Huntington's is a good place to start to try to find cases for the 7x66. My understanding is the brass is custom made and is made on order. It is spendy and takes a long time once the order is placed for Huntington to receive it. I would recommend calling Huntington's before having a rifle built for it first. The 7x66 appears to be a rebated rim cartridge (.512" rim and .545" body). Shoulder angle from Quickload is a touch over 30 degrees. Factory ammo is probably impossible to find stateside, but you might find some in Germany. Hagn was able to hunt down some 7x75R Vom Hofe Super Express factory rounds for my rifle. I wasn't able to locate any in the U.S., and I don't know if Hagn found the loaded ammunition in Canada or his German homeland.

QuickLoad program has the 7x66 cartridge programmed in its software, so you should be able to come up with some starting loads if you can find brass and work up from there for the particular rifle.

The case holds about 93 grains of water according to Quickload and is 2.598" in length. COAL is 3.307". Looks like a slow burning powder like Retumbo or H1000 might be the powders to work with for 160 grain bullets and keep pressures sane according to Quickload...

John,
The Super Express you mentioned might be the 7x75R Vom Hofe Super Express if it was a singleshot or double rifle since it is rimmed.

Edited by DPhillips (07/03/07 07:37 PM)


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svaneknop
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Reged: 11/10/05
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Loc: Denmark
Re: 7x66 Vom Hofe Super Express. [Re: DPhillips]
      #73361 - 08/03/07 04:25 AM

For those of You who read German there is in the last issue (2007/1) of the German magazine "Jagen Weltweit" (hunting around the world) a couple of pages about reloading the 7x66 Super Express vom Hofe. Send me a PM if You want a copy.

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pinotguy
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Reged: 03/02/07
Posts: 57
Loc: CO
Re: 7x66 Vom Hofe Super Express. [Re: DPhillips]
      #73384 - 08/03/07 11:12 AM

Mr. Phillips,

Many thanks for the information and pictures. The profile photo is especially nice as it gives a good idea of the cartridge's shape and size. In exploring Huntington's website a little further, I discovered that Horneber offers brass as well. It's actually slightly more expensive than the Gehmann brass. Anyway, it appears as though the 7x66 should fit into a standard, 30.06-size action although the bolt face would probably need to be extruded a small amount to provide proper case-head support. You may lose one round capacity-wise due to its rather large diameter.

As far as loads go, I'd love to see how the 7mm Barnes TSX and Banded Solids (both in 140-gr.) set up over VihtaVuori N160 or N165 would perform.


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DPhillips
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Reged: 09/10/03
Posts: 819
Loc: Alaska
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73418 - 08/03/07 04:55 PM

You have a PM.

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333Jeffery
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Reged: 21/04/06
Posts: 100
Loc: Florida
Re: 7x66 Vom Hofe Super Express. [Re: DPhillips]
      #73484 - 09/03/07 03:12 PM

I wonder how well VV N560 and N570 powders would work in this cartridge?

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DPhillips
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Reged: 09/10/03
Posts: 819
Loc: Alaska
Re: 7x66 Vom Hofe Super Express. [Re: 333Jeffery]
      #73495 - 09/03/07 07:11 PM

N560 looks like it would give better velocities while keeping pressures within the 7x66 listed maximum. At least for the 140's.

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Rolf
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Reged: 26/02/07
Posts: 332
Loc: Germany, Bavaria
Re: 7x66 Vom Hofe Super Express. [Re: DPhillips]
      #73506 - 09/03/07 11:38 PM

Hi Pinotguy,

I have a Mauser 66 in 7x66 SE vom Hofe and reload for it.

Factory ammunition is in Germany still available with 140grs Ballistic Tip and 175 grs Partition Bullet (if memory serves well), but expensive.

Empty cartridge cases can be obtained at about 45€ / 20 ea.

Reloading should be done with the slow burning powders, but you can improve the ballistics of the 7mm Rem Mag only by a small amount (if you obey the german laws of the gun proofing).

I especially like the long case neck and the case volume of the 7x66 SE vH.
The obtainable precision is about what you can expect from comparable rifle/cártridge combinations.
My gun barrel is a little bit worn and will produce 1.2" for three shots at 100 meters
(154grs Norma Oryx, R905 = Reloader 22, ca. 900m/s/4000 Joule // 2950fps/2900 fpe)

If you want to have a 7mm Magnum cartridge, the 7mm Weatherby would be roughly similar (ballistically), but cheaper.

(further info on request)

best regards
Rolf


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DPhillips
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Reged: 09/10/03
Posts: 819
Loc: Alaska
Re: 7x66 Vom Hofe Super Express. [Re: Rolf]
      #73697 - 12/03/07 04:12 PM

Rolf,
You have a Private Message.

Thanks,

Dave


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gtrotz
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Reged: 25/12/06
Posts: 7
Loc: Catrilo, La Pampa , Argentina
Re: 7x66 Vom Hofe Super Express. [Re: pinotguy]
      #73905 - 15/03/07 09:46 AM

Hi Pinotguy:
I do have a 7x66 SEVH
My opinion after 2 years of reloading efforts is that you will not get what you can get with the new 7mms.
And ... the brass is really expensive and very dificult to replace with other calliber, I transform some 300 ultra cases ,but it was really dificult to obtain the cases for the 7x 66.
I think that there are a lot of other callibers ofering beter perfomance.
My rifle is a Mauser 66
If you want my files send me your e-mail and I will convert them from spanish to english for you
Sincerelly yours
Guillermo Trotz


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