Request Quick load 6.5 Creedmore 22" barrel

[cerralvo78]

I have a Ruger American Predator on 6.5 Creedmore
Shot about 200 factory match rounds so far with good results
loaded 15 rounds for my ladder test 35 to 42.5 with h4350 at .5 increments

From the ladder test I found three posible accuracy nodes. Using 142smk with H4350 powder
1st between 35.5 and 36
2nd between 37 and 38
3rd between 41 and 42

I loaded and chrono the following (pressure test)

43.0 g---2736 fps---no pressure signs
43.5 g---2761 fps---no pressure signs
44.0 g---2801 fps---slightly pressure signs


Can Someone can ran quickload for me??
Just like to verify my data
I use the OBT on a 7 RemMag and got me real close to node

22 inch" barrel
142 smk Sierra or 142 AccuBond Long Range Bullet
Hornady brass trim to 1.915"
COAL 2.800
Case capacity 53.5 gn of water
Powder H4350
Primers 210M

From 35 grains to 44.5 grains

Thanks


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[Dwh7271]

Cartridge          : 6.5 Creedmoor Hornady
Bullet             : .264, 142, Sierra HPBT MatchK 1742
Useable Case Capaci: 47.190 grain H2O = 3.064 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Hodgdon H4350 ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.149% 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

-11.5   90    38.50   2467    1918   45745   9593     96.9    1.311
-10.3   92    39.00   2496    1965   47401   9711     97.3    1.290
-09.2   93    39.50   2526    2012   49116   9825     97.7    1.268
-08.0   94    40.00   2556    2060   50891   9934     98.0    1.248
-06.9   95    40.50   2585    2108   52729  10040     98.3    1.228
-05.7   96    41.00   2615    2156   54633  10141     98.6    1.208  ! Near Maximum !
-04.6   98    41.50   2644    2205   56605  10237     98.9    1.188  ! Near Maximum !
-03.4   99    42.00   2674    2254   58648  10329     99.1    1.169  ! Near Maximum !
-02.3  100    42.50   2703    2304   60766  10416     99.3    1.151  ! Near Maximum !
-01.1  101    43.00   2732    2354   62961  10497     99.5    1.132  !DANGEROUS LOAD-DO NOT USE!
+00.0  102    43.50   2761    2404   65237  10574     99.6    1.115  !DANGEROUS LOAD-DO NOT USE!
+01.1  103    44.00   2790    2455   67597  10646     99.8    1.097  !DANGEROUS LOAD-DO NOT USE!
+02.3  105    44.50   2819    2506   70045  10712     99.9    1.080  !DANGEROUS LOAD-DO NOT USE!
+03.4  106    45.00   2848    2558   72586  10773     99.9    1.063  !DANGEROUS LOAD-DO NOT USE!
+04.6  107    45.50   2877    2610   75224  10828    100.0    1.047  !DANGEROUS LOAD-DO NOT USE!
+05.7  108    46.00   2906    2662   77962  10878    100.0    1.031  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    102    43.50   2816    2499   70796  10402    100.0    1.077  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    102    43.50   2697    2293   59713  10622     98.3    1.158

There should be a node around 2630 or so.
Another is around 43.1 to 43.2 gr if you aren't into pressure there.

 

[cerralvo78]

GREAT
Thanks a lot
No pressure signs up to 44 grains of H4350


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[cerralvo78]

Question
the way you dope or the way you figure out were is your node is to use my speed and match it to your data speed and see which one is closer to the OBT
Regardless of my powder charge is different than yours! is this correct????

Thanks


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[TackDriver284]

We can get a more accurate result with H20 case fills with a fired case, then tweak the Ba to match your chrono speed.

 

[cerralvo78]

What it the "Ba"
Is Ba speed?


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[Dwh7271]

Question
the way you dope or the way you figure out were is your node is to use my speed and match it to your data speed and see which one is closer to the OBT
Regardless of my powder charge is different than yours! is this correct????

I used your 43.5 gr speed to create that run. The 53.5 is the default capacity, as TD said, weigh a fired case with water and get the capacity and we can tighten it up.

For the nodes, I use Chris Long's excel spreadsheet.
http://the-long-family.com/optimal barrel time.htm

 

[cerralvo78]

Thanks
Yes I used Chris's excel
53.5 grains of H2O on a Hornady fire-form case trim to 1.915" is in fact MY capacity



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[Dwh7271]

Cool.
Should be good to go then

 

[cerralvo78]

Cool.
Should be good to go thenGogth

Y