6.5mm-303 Epps data

Varmtr

Well-Known Member
Joined
Apr 20, 2015
Messages
73
Location
Australia
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
 

HARPERC

Well-Known Member
Joined
Jan 28, 2011
Messages
6,333
Location
Spokane, WA
Intersting! I had not heard of this one many years. No info-just tagging in curious as to what you learn.
 

Varmtr

Well-Known Member
Joined
Apr 20, 2015
Messages
73
Location
Australia
Intersting! I had not heard of this one many years. No info-just tagging in curious as to what you learn.
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.
 

Varmtr

Well-Known Member
Joined
Apr 20, 2015
Messages
73
Location
Australia
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?
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
 

jfseaman

Well-Known Member
Joined
Apr 8, 2012
Messages
4,171
Location
California Central Coast
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
Does this look right or close enough (a few .0001 doesn't matter)
 

Attachments

gunners

Well-Known Member
Joined
Feb 6, 2014
Messages
50
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
 

Varmtr

Well-Known Member
Joined
Apr 20, 2015
Messages
73
Location
Australia
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
Would very intersted in this 303 wildcat you have :)
 

jfseaman

Well-Known Member
Joined
Apr 8, 2012
Messages
4,171
Location
California Central Coast
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
 

gunners

Well-Known Member
Joined
Feb 6, 2014
Messages
50
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
 

jfseaman

Well-Known Member
Joined
Apr 8, 2012
Messages
4,171
Location
California Central Coast
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.
 

Trending threads

Top