6.5x257 Roberts

[Hawkeye]

I've got a rifle in this cal inbound. Can anyone tell be anyhting about this calibre it doesnèt exist in my copy of Cartidges of the World.
Thanks

 

[Huntin' Gun]

I'm sure someone will correct me, but I thought the 257 Roberts was the 7x57 necked down to .257 diameter. So a 6.5x.257 Roberts would be a 7x57 necked to 6.5... ie: 6.5x57. Not as popular as the 6.5x55, but still a well known round.

Am I off here?

 

[358 BLR]

I'm sure someone will correct me, but I thought the 257 Roberts was the 7x57 necked down to .257 diameter. So a 6.5x.257 Roberts would be a 7x57 necked to 6.5... ie: 6.5x57. Not as popular as the 6.5x55, but still a well known round.

Am I off here?

Sounds about right to me, but then my hearing isn't the best anymore.

 

[mmattockx]

I'm sure someone will correct me, but I thought the 257 Roberts was the 7x57 necked down to .257 diameter. So a 6.5x.257 Roberts would be a 7x57 necked to 6.5... ie: 6.5x57. Not as popular as the 6.5x55, but still a well known round.

Am I off here?

Shoulder angles may be slightly different among these, but I think that sounds like a reasonable summary of the situation.


Mark

 

[1899]

The 6.5x57 is a commercial cartridge in the old country - as is it's smaller brother the 5.6x57. And the analysis above is spot on - 7x57 necked to .257 is the .257 Roberts, while the 7x57 necked down to .264 is the 6.5x57.

It is available in factory form from RWS.

 

[noneck180]

Sorry should have read the OPs post better..

 

[dan belisle]

I have a 6.5x57. In every way but actual cartridge, it's the same performer as the 6.5x55. And that's not a bad thing to be. - dan

 

[martinbns]

6.5x257 Roberts = gap that doesn't really exist in the ballistic world

 

[diemaco]

What kind of rifle did you get? I've only seen Zastavas in this caliber, not that I've really been looking...

 

[jbmauser]

It was a common practice to rechamber Japanese Type 38 rifles to this. Perhaps this is what you're getting?

 

[Hawkeye]

It was a common practice to rechamber Japanese Type 38 rifles to this. Perhaps this is what you're getting?

Thats the beast

 

[dan belisle]

6.5x57 actually was a Mauser cartridge. Just not an American cartridge, so when they went looking for a way to make all those 6.5 Arisakas that came home usable, they rechambered to an American case (257 Bob) in the 6.5 bore. Sort of the same way the 8mm-06 came to be. A solution to a surplus rifle/no ammo issue. - dan

 

[Pathfinder]

I've got a rifle in this cal inbound. Can anyone tell be anyhting about this calibre it doesnèt exist in my copy of Cartidges of the World.
Thanks

I used to have a Rechambered Arisaka in that same chambering. I used Necked down 7x57 brass (winchester). I already had a 6.5x55 so it became surplus as its so close in case capacity. Very tough rifle..if you're looking for loading info shoot me a pm and Ill dig something up.