Bob the Mauser (.25 Caliber Questions)

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CmdrSlander

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I am working on sporterizing a Yugo M48 Mauser. I want to convert it to a more mild .25 Caliber cartridge such as .257 Roberts or .25-06 Remington. As I understand it, the .257 Roberts was derived from the 7x57mm Mauser cartridge, since the M48 currently fires the 7.92x57mm Mauser cartridge (from which 7x57mm Mauser was derived) would I be able to convert the M48 to .257 Roberts with a simple barrel change? I assume it is possible since the casing has the same dimensions.
 
The bolt handle will need to be modified if you plan on a scope, and action drilled and taped for bases. Al
 
I think you are a little mixed up, the 7x57 has NO parent case it was NOT derived from the 8mm Mauser, ie; 7.92x57, yes the M48's intermediate length action will work great for the .257 Roberts, but NOT for the .25-06 & if you think the .25-06 is milder/tamer than the 7.92x57 then you have never shot a .25-06.............
 
@303tom,

I have to disagree with your statement that the 7mm Mauser has no parent case. I think it most certainly came from the 8x57 as did the 6.5x55 and a whole host of others. Do you have any credible info To back up your statement ?

Not trying to slam you by any means. I've just seen/read other info that contradicts your statement and would like to hear your side it. Thx
 
Further, the .257Robt. if loaded to the same pressure as European factory 8x57, 7x57 or factory .25/06; is only 50-75fps slower than the .25/06. In some instances there is NO difference between the Roberts vs. .25/06.

My best friends best load for his Interarms MkX .25/06 with 24" bbl is 43.0gr of IMR4320 (not best powder for .25/06, but someone forgot to tell HIS rifle) and gets ~2,900fps w/120gr Sierra BtHpt. My 22" bbl M98 custom w/E.R.Shaw bbl and 44.0gr of IMR4831 gets 2,950fps......
In otherwords, the difference between the .257Roberts and .25/06 is less than the difference between the .308 and .30/06 as it should be because the 57mm case splits the difference in case capacity between the .308 and .30/06.
 
texas chase said:
@303tom,

I have to disagree with your statement that the 7mm Mauser has no parent case. I think it most certainly came from the 8x57 as did the 6.5x55 and a whole host of others. Do you have any credible info To back up your statement ?

Not trying to slam you by any means. I've just seen/read other info that contradicts your statement and would like to hear your side it. Thx
Click to expand...
The 6.5x55 is not based on the 8mm Mauser or 7mm Mauser case. It was developed (IIRC) by the Norweigans and Swedes
 
we may have to start a new thread but... the 8x57 is certainly the parent case for the 7x57 and the 6.5x55. Just because it was developed in another country doesn't mean that it wasn't designed from the parent cartridge.
 
While I'm sure the 7x57 was influenced by the Gew.8mm of 1888 it certainly isn't an 8x57(.318'') necked down to .284''. The 8x57 mm with .323'' bore wasn't adopted until 1905. The 6.5x55mm Swede (1891)actually predates both the 7x57 and the 8x57JS(not the 1888).The 7x57mm Spanish Mauser cartridge:parent case none
Case type Rimless, bottleneck
Bullet diameter 7.24 mm (0.285 in)
Neck diameter 8.25 mm (0.325 in)
Shoulder diameter 10.92 mm (0.430 in)
Base diameter 12.01 mm (0.473 in)
Rim diameter 12.10 mm (0.476 in)
Rim thickness 1.15 mm (0.045 in)
Case length 57.00 mm (2.244 in)
Overall length 78.00 mm (3.071 in)
Case capacity 3.90 cm³ (60 gr H2O)
Rifling twist 220 mm (1 in 8.66 in)
Primer type Large rifle
Maximum pressure 390.00 MPa (56,565 psi)
8x57 mm Mauser cartidge-Designer German Rifle Testing Commission
Designed 1903/1905
Variants 8×57mm IRS (rimmed)
Specifications
Parent case M/88
Case type Rimless, bottleneck
Bullet diameter 8.08 mm / .318 (I and IR) and 8.20 / .323" (IS and IRS)
Neck diameter 9.08 mm (0.357 in)
Shoulder diameter 10.95 mm (0.431 in)
Base diameter 11.94 mm (0.470 in)
Rim diameter 11.95 mm (0.470 in)
Rim thickness 1.30 mm (0.051 in)
Case length 57.00 mm (2.244 in)
Overall length 82.00 mm (3.228 in)
Case capacity 4.09 cm³ (63 gr H2O)
Rifling twist 240 mm (1 in 9.45 in)
Primer type Large rifle
Maximum pressure 390 MPa (57,000 psi
 
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Those 2 articles by no means show proof of what you're claiming. Now I do agree that the modern "8mm Mauser" is not the parent case. However the original 8x57 started it all.
 
Oh, yeah, Chuck Hawk. Now THERE'S a real authority... :rolleyes:

I always thought the original 8mm came out in 1888, was last modified in 1905, and the 7mm was introduced in 1892 and was the 8x57 necked down.

But I'm no expert.
 
The original 8mm was designed in 1895, three years after the 7x57..........
 
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The 8x57 j was introduced in 1888 for the gew88 that bears that date.

Next came 7.65x53 for the Belgians in 1889

Last of all was 7x57 in 1892

6.5x55 is not based on the above cartridges and was developed in and around 1893

8x57 was modified to JS specs in 1905

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