6.5 Creedmoor OCW results

[Round2it]

I just shot a 7 string OCW test with my Savage LRP 6.5 Creedmoor and was wondering what some of you might think about my results. I will tell you that the wind was 6-10 mph right to left for the first string and about half that for the other two. I also labeled the shots as they were shot, ie. 1rst, 2nd and 3rd shot. These were shot off a bipod and rear bag.

 

[Darkker]

I think you can decide what you like the best in terms of groups. I can show you what the factory ammo box recommended charge looks like for pressure and curve.

 

[Darkker]

 

[The Oregonian]

I just shot a 7 string OCW test with my Savage LRP 6.5 Creedmoor and was wondering what some of you might think about my results. I will tell you that the wind was 6-10 mph right to left for the first string and about half that for the other two. I also labeled the shots as they were shot, ie. 1rst, 2nd and 3rd shot. These were shot off a bipod and rear bag.

I would go back and work around the weights on the second row....but I am a newbie to reloading. But I have been using the OCW method on the load work I did last summer.

If you overlay targets on the second row how close the the six shots?

 

[wyowinchester]

I like the last one 42.4 They are all on the same horizontal plane so to speak. With windage the only factor.

 

[Wyo7200]

Give me your load data and I can run a QL and see where you are in terms of optimal barrel time nodes.

COAL
velocity if you have it

 

[dsculley]

From what i see, i would test again in the 40.9 - 41.2 area. I would also go the Dan Newberry's forum (Practical Riflery Forums... techniques and equipment of the practical rifleman... Forums) and post the results as well. You can get some really good feedback there. Dan will probably review your post and chime in as well.

Even with the high flier, these two groups are pretty much centered on the same point. Is it possible that the high flier in the 41.2 was due to shooter error?

41.8 looks like a good group, but there appear to be scatter nodes on either side of it. I would try 41 gr H4350 with those 140 gr Amax and see if it prints with the 40.9 & 41.2 If it does, you have a good, wide node. After that I would test seating depth to see if they will tighten up just a bit.

FWIW,

Dennis

 

[Round2it]

Give me your load data and I can run a QL and see where you are in terms of optimal barrel time nodes.

COAL
velocity if you have it

I very much appreciate your offer but I did not crono any of these rounds. I plan to narrow the field, so to speak and will crono then. It would be great if I could send you that data to see where those pressures are.
Thanks for all the feedback so far.
I forgot to mention that before I shot these I had just cleaned the barrel to see how much copper had accumulated and fired only two sighters. There was very little copper at all. Also, I only had 53 rounds down the barrel prior to shooting this string - now 78.

 

[Wyo7200]

No problem. I've found QL's burn rate is within ~100 fps. Whats your OAL and I'll start from there.

 

[Round2it]

The OAL is 2.824 - 2.826"

 

[Wyo7200]

26" barrel nodes in ms:

26.0: 0.8819 0.9661 1.1057 1.1905 1.3295 1.4149 1.5533

42gr is near the 5th node of 1.3295. I haven't adjusted for your burn rate, but as you can see you are getting up there. You will be nearing or exceeding SAAMI max psi if you try to reach the 4th node. Wouldn't recommend it. Seems to go against the OCW so I'd get a velocity reading and I can adjust the burn rate. If its burning faster, the 41.5 range may be your ticket.

Cartridge : 6.5 Creedmoor Hornady
Bullet : .264, 140, Hornady A-MAX 26332
Useable Case Capaci: 47.462 grain H2O = 3.082 cm³
Cartridge O.A.L. L6: 2.825 inch = 71.76 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Hodgdon H4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0 88 37.80 2488 1924 40705 7776 95.9 1.512
-09.0 89 38.22 2513 1964 41934 7861 96.3 1.491
-08.0 90 38.64 2539 2003 43198 7945 96.6 1.471
-07.0 91 39.06 2564 2044 44501 8026 97.0 1.451
-06.0 92 39.48 2589 2084 45842 8104 97.3 1.431
-05.0 93 39.90 2615 2125 47222 8181 97.6 1.412
-04.0 94 40.32 2640 2166 48644 8255 97.9 1.393
-03.0 95 40.74 2665 2208 50108 8327 98.1 1.374
-02.0 96 41.16 2690 2250 51616 8396 98.4 1.356
-01.0 97 41.58 2715 2292 53170 8462 98.6 1.338
+00.0 98 42.00 2740 2334 54771 8526 98.8 1.321 ! Near Maximum !
+01.0 99 42.42 2765 2377 56420 8587 99.0 1.303 ! Near Maximum !
+02.0 100 42.84 2790 2420 58120 8645 99.2 1.287 ! Near Maximum !
+03.0 101 43.26 2815 2463 59872 8701 99.4 1.270 ! Near Maximum !
+04.0 102 43.68 2839 2506 61678 8754 99.5 1.254 ! Near Maximum !
+05.0 103 44.10 2864 2550 63540 8803 99.6 1.237 !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 98 42.00 2849 2523 64335 8296 100.0 1.235 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 42.00 2591 2086 45373 8366 93.9 1.433

 

[Round2it]

I can load and crono 2 or 3 rounds, what how much should I do or would it help if I did 2 different weights?

 

[Bigeclipse]

I very much appreciate your offer but I did not crono any of these rounds. I plan to narrow the field, so to speak and will crono then. It would be great if I could send you that data to see where those pressures are.
Thanks for all the feedback so far.
I forgot to mention that before I shot these I had just cleaned the barrel to see how much copper had accumulated and fired only two sighters. There was very little copper at all. Also, I only had 53 rounds down the barrel prior to shooting this string - now 78.

If this test was at 100 yards...wind would have very little impact on horizontal stringing...there is either something going on with the load, rifle, or your shooting technique

 

[Wyo7200]

Five should be good enough.

I get antsy if I go 20 rounds without cleaning . Although my savage hunter max in 6.5 doesn't seem to collect copper either...