Possibly obsolete through non availability of ammo?

Discussion in 'Shooting, Hunting and Fishing' started by ugly, Oct 11, 2012.

Welcome to the Army Rumour Service, ARRSE

The UK's largest and busiest UNofficial military website.

The heart of the site is the forum area, including:

  1. ugly

    ugly LE Moderator

    I have been barking enough with the Argentinian Mauser but am now sorely tempted by the 6.5 x 58 Portugese Viguerro Mauser. There are a couple about in original calibre and I'm a sucker for old junk. Only problem is ammo. Can you fireform brass to fit?
  2. ugly

    ugly LE Moderator

    Thanks, but for 91 sobs I'll look at fireforming from the 6.5 x 57, apparently this is simple enough!

  3. Try using case lube on your wallet :)
    • Like Like x 6
  4. ugly

    ugly LE Moderator

    I suppose there is a reason that the dies cost more than the rifle but sod that I dont have wall hangers, If I buy it it gets fired! Apparently cartridges of the world reckon its a slimmer diameter case than the x 57 and isnt interchangeable but several posters on other forums seem to think it can be done.
  5. Not quite the same as having an SLR in your SHED. :)
  6. ugly

    ugly LE Moderator

  7. ugly

    ugly LE Moderator

    Nor as much fun but a tad more legal!
  8. Its interesting, but a bit beyond me unless its whanged out on a Dillon.

    With the vagaries of t'internet I know you will not get the same results in the same order as me so I've taken the liberty on your behalf:


    Portugese mauser 6.5 x 58

    6.5x58 Portuguese cartridges
  9. ugly

    ugly LE Moderator

    Cheers me dears!
    I had already been on the ZA website and on milsurp after hours
  10. When I'm at home Iwrite on canadiangunnutz.com - this is from a fellow milsupr shooter and might be of some use to you - anyone else who is bored with long posts look away now -

    1. [h=2]6.5x58 Portuguese loading with RL-17 powder[/h]
    2. Managed to try some loads with a chrono last night.
      Dealing with rare old calibers with brand new powders can be interesting to find min/max levels.

      Here are the results.

      String: 5
      Date: 12/10/2012
      Time: 11:35:28 PM
      Grains: 140
      Hi Vel: 2433
      Low Vel: 2339
      Ave Vel: 2380
      Ext Spread: 94
      Std Dev: 37
      6.5x58P 39gr RL-17
      Velocity Power Factor Ft/Lbs
      2433 423.342 2286.836
      2402 417.948 2228.932
      2355 409.77 2142.559
      2372 412.728 2173.603
      2339 406.986 2113.544

      String: 6
      Date: 12/10/2012
      Time: 11:44:37 PM
      Grains: 140
      Hi Vel: 2437
      Low Vel: 2398
      Ave Vel: 2416
      Ext Spread: 39
      Std Dev: 17
      6.5x58P 39.5gr RL-17
      Velocity Power Factor Ft/Lbs
      2402 336.28 1793.394
      2411 337.54 1806.858
      2437 341.18 1846.038
      2433 340.62 1839.983
      2398 335.72 1787.426

      String: 7
      Date: 12/10/2012
      Time: 11:45:59 PM
      Grains: 140
      Hi Vel: 2455
      Low Vel: 2437
      Ave Vel: 2446
      Ext Spread: 18
      Std Dev: 6
      6.5x58P 40.0gr RL-17
      Velocity Power Factor Ft/Lbs
      2455 343.7 1873.409
      2450 343 1865.786
      2446 342.44 1859.699
      2437 341.18 1846.038
      2446 342.44 1859.699

      String: 8
      Date: 12/10/2012
      Time: 11:47:44 PM
      Grains: 140
      Hi Vel: 2496
      Low Vel: 2478
      Ave Vel: 2484
      Ext Spread: 18
      Std Dev: 8
      6.5x58P 40.5gr RL-17
      Velocity Power Factor Ft/Lbs
      2496 349.44 1936.506
      2478 346.92 1908.676
      2478 346.92 1908.676
      2487 348.18 1922.566

      40 and 40.5grs of Reloder 17 gave pressure signs of flattened primers

      Bolt is mismatched.

      No accuracy tests yet ​
    The 6.5X58 has a capacity between the 6.5X55 and the 6.5-06, so you can use 6.5X55 loads as a benchmark. There isn't much in the way of load data for Re17, but there's lots for H4350, and I have found that Re17 is close to H4350 in Burn Rate.

    You don't state what firearm you're shooting it in (M1904 Portuguese Mauser?), nor the barrel length, but with that powder and that bullet, 2500 fps would be a modest upper level for MV, and correlate to about 40K psi. The "pressure sign" you're detecting isn't...............

    All that having been said, I think you're about where you want to be, and thanks for sharing. I 've shot a grand total of five shots with mine, and never shared the load data - I didn't think anyone would care.