7.62X57

[Rednexx]

I was curious has anyone ever heard of a 7.62X57, I know there are the following 5.6X57 ,6X57 aka 6mm Remington, 6.3X57 aka 257 Roberts, 6.5X57, 7X57, 7.92X57 aka 8mm Mauser, 9X57, 9.3X57 and 9.5X57 but wonder if there was ever anyone that did a 7.62X57 would also be a 308X57

 

[jackieschmidt]

Possibly the cartridge length could be the big reason That the 7mm Mauser necked up to 30 caliber never caught on.

It would be difficult to use in most short actions.

 

[mac86951]

Possibly the cartridge length could be the big reason That the 7mm Mauser necked up to 30 caliber never caught on.

It would be difficult to use in most short actions.

A need for a long action and availability.of 7.62x63.

All joking aside, it's quite possible a 7.5x57 was designed; though 7.5x55 was available not sure it would gain popularity or be a significant difference, but that never stopped anyone from making a cartridge in past, nor present.

I'm curious as to the OPs question, you looking for next project ideas, or just curious about cartridges?

-Mac

 

[Lee in Texas]

I ordered a Manson reamer for that. The drawing was made by a friend of mine in Germany. Wildcatting is not the same over there. They have to be tested by their equivalent of SAAMI. I’ll send an e-mail and ask about it.

 

[Laurie]

I know there are the following 5.6X57 ,6X57 aka 6mm Remington, 6.3X57 aka 257 Roberts, 6.5X57, 7X57, 7.92X57 aka 8mm Mauser, 9X57, 9.3X57 and 9.5X57

They all predate 7.62 / 308 Win bar the 5.6X57 and improved 6X57 aka 244/6mm Rem, so used an existing continental European case and 'locally' well established / developed bullets. The UK and Switzerland aside, European deerhunters and competitors generally weren't keen on 30-calibre either until fairly recently.

in addition, the 30-06 and 308 were either banned completely in many European countries until recently, or if allowed required enhanced licencing checks, costs, and restrictions as they were classed as 'military cartridges' and not allowed for civilian use. (This legal factor was the reason behind many European 'wildcats', pistol as well as rifle, thereby producing the 9X21mm Italian originating design for instance as civilian ownership of standard 9X19mm Para pistols was illegal for many. The 9X21mm is identical to the standard 9mm Para bar the case being lengthened by all of 2mm!) The 5.6X57mm is a specialist continental European variation developed for the small Roe deer species where a 70lb animal is large, but provides the most common form of deerhunting across the entire continent. (Conversely, in the UK, Scotland allows 224 cartridges for Roe, but England and wales still insist on 6mm minimum calibre / >1,700 ft/lb ME.) So, there are many 'local' reasons for these variations on a theme.

As the nominal water capacity of the 7X57mm case is c. 59gn, only 3gn / 5.4% more than 308 Win, any performance enhancement is small even if run at 308 Win SAAMI pressures instead of the lower CIP 7X57 maximum. The AI version adds another 3 or 4gn capacity, so a possible 12 or 13% capacity increase. The rule of thumb is divide the case capacity change by 4 to get the % MV change, all other things equal (peak pressure, bullet, barrel length). So, if run at 308 max pressures (safe?) a 7.62X57AI would offer a 3-4% MV improvement, ie around 85-110 fps, on a 2,800 fps 308 loading. A fun project, but no great gain and possibly using a weaker case.

The Swiss 7.5X55 is a better bet as a beefed-up 308 and filler for the 308 to 30-06 gap. Although its CIP MAP is below that of the SAAMI 308, this is a proven strong case and has seen many developments and heavy loads in Swiss use where turnbolt rifles replace straight-pull or semi-auto rifles. (It's also an impressive long distance machinegun cartridge and remains in Swiss service use in the MG51 gun.)

 

[M from Germany]

Hallo,

i´ve made the Design for the 7,62x57mm.
Main Goal was to close the Gap between the 7x57 and the 8x57 creating a "modern" .30" Cartridge that was able to deliver the max. Performance from a Standard 12mm Casehead.......
The Result is based on the 9,3x62 Case, simply because a 7x57 was to short after forming a "Ackley-like" Case.
Another benefit ist that using the Manson-made Reamer you can cut away a .308Win Chamber at all Dimensions.

In final testing we were able to get 3056fps. loading 165/168grs. Bullets.
24,5" BBL. within save Pressure levels.
Powders used are RS-62, NORMA 204,.......
Cases are from SHM Germany. ( No forming / Fireforming needed....)
left 7,62x57, right 308Win........



Reloading Dies are made by HORNADY.

@ Lee, thanx for the helping Hand.

Best

M from Germany

 

[Will Henry]

I produced a 7.62 x 57 by simply running the 308 reamer in another 6 mm. I use 8x57 for parent brass. My idea was to split the difference between the 308 and '06 and get better velocities with heavier bullets without loading too hot; like one often sees in the 308. I got sidetracked and have not done much with it since I chambered it but, in my mind, it will be a winner! WH

 

[M from Germany]

Sorry, Btw. there´s a rimmed Version also.....this one based on a 7x57R Case

M from Germany