Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

My latest acquisition: Webley Mk IV

Discussion in 'Handguns: Revolvers' started by Yoda, Mar 17, 2013.

Thread Status:
Not open for further replies.
  1. Yoda

    Yoda Member

    Joined:
    Jul 17, 2008
    Messages:
    601
    Location:
    Florida, bouncing between Hurlburt Fld and MacDill
    I have a question. At some time in the past, someone punched out the last "5" in the ".455" caliber marking, aparently wanting to indicatge that the gun had been converted to .45. However, the barrel also says, "760"" (760 inches?) and "6 tons." Are these pressure ratings? Is the Mk IV REALLY OK to shoot .45 ACP?

    Your thoughts?

    - - - Yoda

    [​IMG][/IMG]
     
    Last edited: Mar 17, 2013
  2. highlander 5

    highlander 5 Member

    Joined:
    Sep 15, 2006
    Messages:
    2,308
    Location:
    lynn,ma
    I seem to remember someone on this site or another asking the same question and got the impression that standard 45 acp ammo is hot compares to 455 Webley ammo.
    I beleive 455 ammo is around 650-700 fps with a 265 gr lead bullet. You might be able to make usable ammo from 45 auto rim brass.
     
  3. bannockburn

    bannockburn Member

    Joined:
    Apr 24, 2007
    Messages:
    13,768
    Yoda

    The 6 TONS mark indicates standard service pressure (in long tons or 2,240 lbs.), for that cartridge; it is not a proof mark. That would make operating pressure to be around 13,340 psi. The .45ACP is rated at between 19,000 to 21,000 psi. That would put the .45ACP well beyond the pressure range of even the proof loads for the .455 Webley. The .760 marking indicates the nominal length of the .455 cartridge.
     
    Last edited: Mar 17, 2013
  4. Yoda

    Yoda Member

    Joined:
    Jul 17, 2008
    Messages:
    601
    Location:
    Florida, bouncing between Hurlburt Fld and MacDill
    Can a .45 ACP-converted Webley still fire .455?

    Since I made the original post, I've done my homework. I guess I won't be loading this veteran with .45 ACP. I'm wondering, though, if it could still be fed .455? Might be more expensive to shoot, but at least it won't blow up on me!

    - - - Yoda
     
  5. Yoda

    Yoda Member

    Joined:
    Jul 17, 2008
    Messages:
    601
    Location:
    Florida, bouncing between Hurlburt Fld and MacDill
    Thanks, bannockburn. It's good, competent advice and information, as exemplified by your response, that makes this forum so valuable. You may have just saved me from a kaboom, because I was thinking of taking the Webley to the range today, but since reading your note, I may check to see if I can still shoot regular .455 in it.

    Thanks again.

    - - - Yoda
     
  6. Radagast
    • Contributing Member

    Radagast Moderator Staff Member

    Joined:
    Dec 24, 2002
    Messages:
    8,148
    Location:
    Australia/OZ
    Probably not, as the rear of the cylinder will have been cut for moon clips if it has been converted to .45acp.
    The best solution is to hand load .45acp to .455 pressure levels.
    Use of .45ACP can result in stretching or failure of the stirrup that holds the frame together, or in extreme cases can shatter the cylinder.
     
  7. Slamfire

    Slamfire Member

    Joined:
    Dec 29, 2006
    Messages:
    7,579
    Location:
    Alabama
    I have one of these and after testing it with a number of handloads, I am going to stick with the lightest one.

    Whoever did the caliber conversion did it cheap and reamed the chamber mouths oversize.

    Also the barrel is not exactly small. I found .454 diameter bullets shot OK with a little leading. Smaller bullets gave more leading. I don’t have a mold that casts bullets .457, the larger dimensions are probably more appropriate.

    I thought I would use some loads I developed in my 45 ACP revolvers. I had some Elmer Keith loads of a 250 with 6.5 grains Unique. That load was way to hot in a Webley. Actually stretched the top strap recess!

    After that happened I realized that this mechanism is a lot weaker than any solid frame I have ever handled.

    I also reconsidered using Elmer Keith loads in any of my 1917’s. His loads are entirely too hot for vintage pistols.

    I eventually decided that 3.5 grains Bullseye was a good load. It shot to point of aim and was easy on the pistol.


    45 Auto Rim

    455 Webley MkVI rechambered 45ACP
    manufactured Enfield 1923


    255 LSWC (.454) 3.5 grs Bullseye thrown, R-P AR cases, CCI300 primers
    Jun-Aug 02
    Ave Vel = 541
    Std Dev = 10
    ES = 42.44
    Low = 522
    High = 565
    N = 24
    Shot to point of aim 25.0 yards


    255 LSWC (.454) 4.0 grs Bullseye thrown, R-P AR cases, CCI300 primers
    20-Jan-02 T = 42 °F
    Ave Vel = 640
    Std Dev = 21
    ES = 79.1
    Low = 586
    High = 665
    N = 12
    Shot to point of aim 25.0 yards


    255 LSWC (.454) 4.5 grs Bullseye thrown, R-P Auto Rim cases, CCI300 primers
    20-Jan-02 T = 42 °F
    Ave Vel = 681
    Std Dev = 8
    ES = 28.4
    Low = 667
    High = 696
    N = 12
    Shot to point of aim 25.0 yards better accuracy



    250 LRN (.454) 6.5 grs Unique thrown, R-P Auto Rim cases, CCI300 primers
    20-Jan-02 T = 44 °F
    Ave Vel = 801
    Std Dev = 21
    ES = 79.2
    Low = 776
    High = 855
    N = 12
    2 O'C hold kept them all on target, medium recoil

    Dangerous overpressure load. Way too hot, excessive effort to open latch, topstrap stretched!

    [​IMG]
     
  8. bannockburn

    bannockburn Member

    Joined:
    Apr 24, 2007
    Messages:
    13,768
    Yoda

    Glad to be of service. Given the higher pressures of the .45ACP and the inherent structural weakness of the top-break design, you will have to stick to loads that are in the pressure range of the .455 cartridge. The problem is, as Radagast pointed out, is that the back of the cylinder has been turned down (or shaved as it were), to accomodate the .45ACP cartridges with moon clips. I believe that even if you found some .455 ammo it can no longer be used in a cylinder that has been modified in this way.

    I think Radagast also has a very viable solution in that the best thing for you to do is to make up some light and mild .45ACP handloads for your Webley Mk.IV, based on .455 loading data. Hope everything works out okay and let us know how it goes. Enjoy.

    Edit: Just saw SlamFire1's posting. Great information there!
     
    Last edited: Mar 17, 2013
  9. Carl N. Brown

    Carl N. Brown Member

    Joined:
    May 10, 2005
    Messages:
    7,928
    Location:
    Kingsport Tennessee
    My MkIV has first and second BP proofs on each chamber out side of the cylinder, both with crown and VR which I take to be Victoria Regina (Queen Victoria 1837-1901). The factory thorough repair stamp appears to be '04 which I take to be 1904 (this is an 1899 design).

    Mine was cut by the importer for .45 AutoRim or .45 ACP in moonclips. At some point it recieved a parkerized -looking refinish. I reload .45 Auto Rim cases with .454" 255gr bullets intended for .45 Colt cowboy loads and either BP or light Unique loads mimicking recommendations for .455 Webley in the original MkIV timeframe.

    I have fired less than 100 rounds of 45 ACP in moonclips, and do not wish to test a BP proof gun further with modern ammo. I also do .455 level reloads in .45 ACP cases and use these in moonclips; these are awfully convenient for reloading/unloading the gun. The casing fired in my AutoOrdnance .45ACP pistol and carbine are actual a good fit for the .455 and I treat them as one use. .455 chambers are roomy compared to .45ACP. .45 AutoRim fired in a .455 chamber is a pain to resize.

    The MkV Webley revolver is simply the MkIV beefed up for cordite and nitrocellulose powders and the outside of the cylinder is noticeably thicker. So no factory .45 ACP in my MkIV unless its the zombie apocalypse and I have no time for reloading.
     
    Last edited: Mar 17, 2013
  10. TheDaywalkersDad

    TheDaywalkersDad Member

    Joined:
    Sep 11, 2012
    Messages:
    52
    Location:
    Richmond, VA
  11. tekarra

    tekarra Member

    Joined:
    Feb 13, 2007
    Messages:
    1,277
    That is a fine looking Webley Yoda. There is just something about those revolvers.
     
Thread Status:
Not open for further replies.

Share This Page