Let's talk about 2 mile cartridges

[hubel458]

Correction- little one on the left is 378 Wea...Ed

 

[hubel458]

picture of our 375 HE hydro die.

Base is adjustable, which great aid in getting best case results.

We use it on real solid surface like lathe bed.Ed

 

[hubel458]

Picture of the 416 HE target case, these run through

the hydro-die, test gun done, testing soon, to confirm specs.Ed

 

[rem338um]

A quick ? from a not so smart guy...why does most people design a cartridge around the 30 degree shoulder and not use a 35 or 40 degree shoulder....doesn't the latter help with case stretch and help with not torching the lands? I had a 6 Ackley back in the day and it did well from my single shot Panda,,,may need be the greatest to mag feed......Sorry to interrupt all this knowledge and thanks for the GOOD reading. FYI my 375 Cheytac is up and running...350 gr CT solids @ 3025 from a 34" 10 twst barrel got sd's to 6 using Retumbo.....Carrry on...

 

[Deleted member 46119]

It's a great question.

• P.O. Ackley preferred 40° shoulders. Helps with stretch, brass migration up the neck and flame focus.
• Myself and others prefer 35°. Sort of the case of too much of a good thing, 40° that is. Even though most of these big ELR cartridges we are designing and making are single load and require bolt release to removed an unfired round, they still have to ramp into the chamber. I got my 35° preference from the WSM line.
• Manufacturers, until recently stayed at 30° and below. This had roots going back to the 8mm Mauser. in 1888. Shoulder angles of 15° were very common. Simple, they feed from the magazine.

 

[hubel458]

Actually most wildcatters are doing steeper shoulders.

I personally want top speed for ELR shooting and 30 deg focuses the force of the

powder behind bullet better with using longer freebore, with bullet loaded out

of the powder space We will get 400 gr to 3400 that way. If brass migrates a little

in making it so much the better for more capacity.Ed

 

[THEIS]

Hello,

Maybe it's time to revisit and revise the 9x85 and 9x90 MEN cartridges...just neck them up/down to 375 and 338 diameter projectiles.

9 x 90
Rim: 20.21mm
Head: 20.23mm
Shoulder: 18.44
O/L length: 118mm

9 x 85
Rim: 17.54mm
Head: 17.53mm
Shoulder: 16.44mm
O/L length: 115mm


THEIS

 

[Deleted member 46119]

Hello,

Maybe it's time to revisit and revise the 9x85 and 9x90 MEN cartridges...just neck them up/down to 375 and 338 diameter projectiles.

9 x 90
Rim: 20.21mm
Head: 20.23mm
Shoulder: 18.44
O/L length: 118mm

9 x 85
Rim: 17.54mm
Head: 17.53mm
Shoulder: 16.44mm
O/L length: 115mm


THEIS

I need more specification than that and any chance of a brass source.

 

[Deleted member 46119]

After some head scratching and reviewing many Google search combinations I came up with what is already known. 460 Steyr.

This is virtually a 50BMG based case. Reformed, shortened and necked to 458. Even the pressure limits are the same as a 50BMG.

Definitely a contender in any caliber from 375 to 458.

Not quite what I'm looking for.

 

[THEIS]

I need more specification than that and any chance of a brass source.

Fred,

The 9x90 MEN was part of a joint venture between HK and Metallwerk Elisenhutte Nassau back in late 80s, early 90s. HK was to make the rifle which was the WSG2000 but it never made it past prototype stages. MEN made the ammunition. It is essentially a necked down BMG to house a 340gr 9mm diameter projectile. It ran at 3440fps with what IMO was very poorly made projectiles when compared to todays standards. It operated at 58k psi chamber pressure but the projectile only had BC of something like .78

I am awaiting confirmation from German and Switzerland entities in regards to brass. I seriously think we may revive this project since we are already utilizing a BMG sized rifle...

THEIS

 

[Deleted member 46119]

I am awaiting confirmation from German and Switzerland entities in regards to brass. I seriously think we may revive this project since we are already utilizing a BMG sized rifle...

THEIS

This is what I need. 58kpsi brass would be much better than BMG.

 

[Deleted member 46119]

The more interesting of the two MEN cartridges is the 9mm x 85mm.

It would have a base if .690 and a length of 3.35 when necked for what we want.

Brass source!

 

[Deleted member 46119]

I can start drawing it up and see what I get.

 

[THEIS]

The more interesting of the two MEN cartridges is the 9mm x 85mm.

Yea that is one I am interested in.

MEN also has a x77 version.

L to R:

A group photo of the .375 CheyTac, .408 CheyTac, 9x77, 9x90 and 9x85

THEIS