6.5mm-303 Epps data

Discussion in 'Reloading' started by Varmtr, May 28, 2015.

  1. Varmtr

    Varmtr Well-Known Member

    Messages:
    73
    Joined:
    Apr 20, 2015
    G'Day

    I'm wondering if anyone has reload data for the 6.5mm-303 Epps, quick load or load from a disk.
    The rifle is a Winchester P14. Powder wise ADI or Reloader or Hodgdon's ( which some is made by ADI ). I'm thinking I will most likely need a burn rate around the ADI2213SC powder or equivalent, give or take.
    Not sure what projectiles will be running as yet so hopefully a bit of a spread sheet for different weight projectiles and powder if possible.

    Cheers
    Rossco
     
  2. HARPERC

    HARPERC Well-Known Member

    Messages:
    5,180
    Joined:
    Jan 28, 2011
    Intersting! I had not heard of this one many years. No info-just tagging in curious as to what you learn.
     
  3. Varmtr

    Varmtr Well-Known Member

    Messages:
    73
    Joined:
    Apr 20, 2015
    Yeh its an oldie. I got a reply from ballistic studies in New Zealand with some data but for the 25-303 Epps. With 117gr SST start around 43gr of AR2213SC at least it's a start even thou I'm running the 6.5-303 Epps.
    Read a couple of articles of the 25-303 Epps here and from what they say you can get them fairly honkin.
     
  4. jfseaman

    jfseaman Well-Known Member

    Messages:
    4,172
    Joined:
    Apr 8, 2012
    I don't have my Ackley book handy and I can not find the dimensions online.

    Do you have more information so I can model it properly?
     
  5. Varmtr

    Varmtr Well-Known Member

    Messages:
    73
    Joined:
    Apr 20, 2015
    G'Day

    The case dimensions are from what I can find is:

    Neck length 0.334".
    Shoulder angle 35 degrees
    Case diameter at shoulder. 0.445"
    Base to shoulder 1.735"
    Case head diameter 0.455"
    Case length 2.175" I think
    Case capacity 55.2 grains of water

    Cheers
    Rossco
     
  6. jfseaman

    jfseaman Well-Known Member

    Messages:
    4,172
    Joined:
    Apr 8, 2012
    Does this look right or close enough (a few .0001 doesn't matter)
     

    Attached Files:

  7. jfseaman

    jfseaman Well-Known Member

    Messages:
    4,172
    Joined:
    Apr 8, 2012
  8. gunners

    gunners Well-Known Member

    Messages:
    49
    Joined:
    Feb 6, 2014
    I have developed a 303 Mad wild cat based off the Brit case like the EPPS but with even more capacity. Reloder 17 seems to go well even in a pressure handicapped action like a No4 mk1. AR 2209 has proven quite accurate as well, I don't think you should have to many issues with a reasonably strong action like a P14 starting around the 25-303 EPPS and working up. Also it looks like similar capacity to a 6.5x55 apart from shoulder angle. I would probably weigh some water in a fired neck resized case, and if close use the starting data for that and work up from that.
    I used 30-06 starting loads -2 grains when I started my development as it seemed to be the closest comparable case, I have 66+ gr H2O capacity and I think a 30-06 is about 67-68 and comparable charges seem to yield comparable velocities
     
  9. Varmtr

    Varmtr Well-Known Member

    Messages:
    73
    Joined:
    Apr 20, 2015
    G'Day
    That picture looks pretty much spot on. Thanks for that.
    A QL loading data would terrific would give a few options on powders charge weights etc.
    Cheers
    Rossco
     
  10. Varmtr

    Varmtr Well-Known Member

    Messages:
    73
    Joined:
    Apr 20, 2015
    Would very intersted in this 303 wildcat you have :)
     
  11. jfseaman

    jfseaman Well-Known Member

    Messages:
    4,172
    Joined:
    Apr 8, 2012
    Cartridge : 6.5-.303 Epps
    Bullet : .264, 129, Nosler AccuBond LR 58943 G7
    Useable Case Capaci: 51.521 grain H2O = 3.345 cm³
    Cartridge O.A.L. L6: 2.985 inch = 75.82 mm
    Barrel Length : 24.0 inch = 609.6 mm
    Powder : Hodgdon H4831

    Predicted data by increasing and decreasing the given charge,
    incremented in steps of 2.326% of nominal charge.
    CAUTION: Figures exceed maximum and minimum recommended loads !

    Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
    % % Grains fps ft.lbs psi psi % ms

    -23.3 71 32.99 1911 1046 18823 6131 73.1 1.888
    -20.9 74 33.99 1966 1108 20108 6434 74.8 1.840
    -18.6 76 34.99 2023 1172 21481 6739 76.5 1.792
    -16.3 78 35.99 2080 1240 22950 7045 78.1 1.746
    -14.0 80 36.99 2138 1310 24521 7351 79.7 1.700
    -11.6 82 37.99 2197 1383 26203 7657 81.3 1.656
    -09.3 84 38.99 2256 1458 28002 7961 82.9 1.613
    -07.0 87 39.99 2316 1537 29932 8261 84.4 1.571
    -04.7 89 40.99 2376 1618 31999 8558 85.8 1.529
    -02.3 91 41.99 2437 1702 34216 8850 87.2 1.489
    +00.0 93 42.99 2499 1788 36595 9135 88.6 1.450
    +02.3 95 43.99 2560 1878 39151 9413 89.9 1.403
    +04.7 97 44.99 2622 1970 41901 9682 91.1 1.359 ! Near Maximum !
    +07.0 100 45.99 2685 2064 44859 9942 92.3 1.316 ! Near Maximum !
    +09.3 102 46.99 2747 2162 48047 10190 93.4 1.275 ! Near Maximum !
    +11.6 104 47.99 2810 2262 51488 10426 94.4 1.235 !DANGEROUS LOAD-DO NOT USE!

    Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
    Data for burning rate increased by 10% relative to nominal value:
    +Ba 93 42.99 2658 2024 43698 9626 95.4 1.337 ! Near Maximum !
    Data for burning rate decreased by 10% relative to nominal value:
    -Ba 93 42.99 2311 1530 30283 8274 78.9 1.562
     
  12. jfseaman

    jfseaman Well-Known Member

    Messages:
    4,172
    Joined:
    Apr 8, 2012
    Ok, I made one with a Nosler 129 ABLR.

    I need to know your actual bullet and COAL.
     
  13. gunners

    gunners Well-Known Member

    Messages:
    49
    Joined:
    Feb 6, 2014
    That's some terrific work jfseaman, the pressure could run a bit higher though seeing its in a P14 action ( essentially a Mauser style action) not a weak SMLE action. Need the COAL and actual case capacity to refine it, I'm thinking H 4831 is too slow to fully utilise your rifles capability
    Varmtr I'll have to take some pictures to show you, it's running 2810 for a 150 gr and 2620 for a 174gr from a 22 inch barrel on a No 4 action. Had some faster loads but my chrono fell over and bent the screens
     
  14. jfseaman

    jfseaman Well-Known Member

    Messages:
    4,172
    Joined:
    Apr 8, 2012
    Yeah, you probably can go higher on the pressure in a P14.

    Still need to know which bullet and COAL for more accurate load tables. Faster powder that could reach the max of the action makes this important to me. Safety first.