+ Reply to Thread
Results 1 to 6 of 6

Thread: The other caliber purposed by Frankfort Arsenal for the AR-15

Click here to increase the font size Click here to reduce the font size
  1. #1
    Legacy Member RCS's Avatar
    Join Date
    Mar 2009
    Last On
    Yesterday @ 11:35 PM
    Location
    USA
    Posts
    4,112
    Real Name
    Robert Seccombe
    Local Date
    12-07-2022
    Local Time
    07:29 AM

    The other caliber purposed by Frankfort Arsenal for the AR-15

    During the development of the 7,62 NATO cartridge the US Project Salvo also continued with the idea of having a cartridge that fired more than one bullet.

    By 1959 another cartridge was designed with the assistance of Frankfort Arsenal to replace the 222 Remington (5,56mm) for the AR-15 rifle,

    The new cartridge used the 25 Remington cartridge modified and called the 6,35x48mm (also a 6,35x52 too). Winchester manufactured some of the cartridges WCC 59 and Frankfort FA 58.

    The single bullet 6.35x48 fired a 70gr bullet at 3,345 fps while the duplex (FA-T127) fired a 54 gr bullet & 55 gr bullet at 2600 fps and 2460 fps.

    This cartridge was tested in bolt action rifles and designed to be used in the AR-15 rifle but the 222 Remington Special became the 223 and 5,56mm cartridge used in the AR-15. My photos show the 25 Rem and 6,35 cartridges - green tip is duplex loading
    Attached Thumbnails Click image for larger version

Name:	DSCN1963.JPG‎
Views:	105
Size:	859.3 KB
ID:	128185   Click image for larger version

Name:	DSCN1979.JPG‎
Views:	104
Size:	846.0 KB
ID:	128186  

  2. The Following 4 Members Say Thank You to RCS For This Useful Post:


  3. # ADS
    Friends and Sponsors
    Join Date
    October 2006
    Location
    Milsurps.Com
    Posts
    All Threads
    A Collector's View - The SMLE Short Magazine Lee Enfield 1903-1989. It is 300 8.5x11 inch pages with 1,000+ photo’s, most in color, and each book is serial-numbered.  Covering the SMLE from 1903 to the end of production in India in 1989 it looks at how each model differs and manufacturer differences from a collecting point of view along with the major accessories that could be attached to the rifle. For the record this is not a moneymaker, I hope just to break even, eventually, at $80/book plus shipping.  In the USA shipping is $5.00 for media mail.  I will accept PayPal, Zelle, MO and good old checks (and cash if you want to stop by for a tour!).  CLICK BANNER to send me a PM for International pricing and shipping. Manufacturer of various vintage rifle scopes for the 1903 such as our M73G4 (reproduction of the Weaver 330C) and Malcolm 8X Gen II (Unertl reproduction). Several of our scopes are used in the CMP Vintage Sniper competition on top of 1903 rifles. Brian Dick ... BDL Ltd. - Specializing in British and Commonwealth weapons Chuck in Denver ... Buy-Sell-Trade .. Guns, Cars Motorcycles Your source for the finest in High Power Competition Gear. Here at T-bones Shipwrighting we specialise in vintage service rifle: re-barrelling, bedding, repairs, modifications and accurizing. We also provide importation services for firearms, parts and weapons, for both private or commercial businesses.
     

  4. #2
    Contributing Member CINDERS's Avatar
    Join Date
    Nov 2009
    Last On
    Today @ 03:11 AM
    Location
    Southern Corner Western Australia
    Posts
    7,140
    Real Name
    CINDERS
    Local Date
    12-07-2022
    Local Time
    07:29 PM
    I've always wondered about the duplex loading with ammunition as the second round will I think effectively push the first one when the 2nd enters the bore and obturates into the rifling therefore stopping any of the gasses from pushing on the first round.
    One wonders as to a pressure spike once the 2nd projie starts pushing against the first as I cannot see any other way a duplex round would work is this a correct summation.

    Nice rare rounds RCS very much enjoying the cartridges that are being displayed between us, I have a fair few wildcats in my collection as well.

  5. Thank You to CINDERS For This Useful Post:

    RCS

  6. Avoid Ads - Become a Contributing Member - Click HERE
  7. #3
    Legacy Member RCS's Avatar
    Join Date
    Mar 2009
    Last On
    Yesterday @ 11:35 PM
    Location
    USA
    Posts
    4,112
    Real Name
    Robert Seccombe
    Local Date
    12-07-2022
    Local Time
    07:29 AM
    Thread Starter
    I also enjoy talking about the different cartridges and sharing the photos on this website, which is the best website
    for serious discussion of small arms and ammunition. I hope the membership also enjoys our cartridge postings too.

  8. The Following 3 Members Say Thank You to RCS For This Useful Post:


  9. #4
    Advisory Panel browningautorifle's Avatar
    Join Date
    Jul 2008
    Last On
    Today @ 02:42 AM
    Location
    Victoria BC
    Posts
    27,926
    Real Name
    Jim
    Local Date
    12-07-2022
    Local Time
    03:29 AM
    Quote Originally Posted by RCS View Post
    I hope the membership also enjoys our cartridge postings too.
    We do, I'm just reticent to go down and take pics of mine to post. I do have a couple but most are displayed here by you two already.
    Regards, Jim

  10. The Following 4 Members Say Thank You to browningautorifle For This Useful Post:


  11. #5
    Advisory Panel Lee Enfield's Avatar
    Join Date
    Oct 2006
    Last On
    Yesterday @ 08:50 PM
    Location
    out there
    Posts
    1,734
    Local Date
    12-07-2022
    Local Time
    04:29 AM
    My Grandparents had popular science and Popular Mechanics from the 30s thru the early 70s.
    The duplex 7.62 resulted in several articles in the early 60s (along with some really cool submarine propulsion systems that don't seem to have taken off).

  12. The Following 2 Members Say Thank You to Lee Enfield For This Useful Post:


  13. #6
    Contributing Member CINDERS's Avatar
    Join Date
    Nov 2009
    Last On
    Today @ 03:11 AM
    Location
    Southern Corner Western Australia
    Posts
    7,140
    Real Name
    CINDERS
    Local Date
    12-07-2022
    Local Time
    07:29 PM
    Be interesting to hear what they said about them, I could troll through some of my books on ballistics not sure Mann covered those types his was more along the line of trajectory and the oscillations of the round in flight from memory.

+ Reply to Thread

Similar Threads

  1. re-purposed transit case
    By smle addict in forum The Lee Enfield Knowledge Library Collectors Forum
    Replies: 10
    Last Post: 08-03-2021, 05:43 PM
  2. Arsenal
    By Mikecp@2022 in forum 1911/1911A1 Service Pistol
    Replies: 2
    Last Post: 11-04-2012, 10:33 PM
  3. Anyone know what arsenal(s) these are from
    By highpower3006 in forum M1903/1903A3/A4 Springfield Rifle
    Replies: 7
    Last Post: 04-20-2012, 09:59 AM
  4. sub caliber or chamber inserts or auxilary caliber
    By RCS in forum The Watering Hole OT (Off Topic) Forum
    Replies: 2
    Last Post: 08-08-2011, 10:42 PM
  5. Arsenal Marks
    By armabill in forum Pattern 1913/1914 and M1917 Rifles
    Replies: 2
    Last Post: 05-03-2010, 01:32 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts