Quickload request: 6.5 CM

bdbrown66 · Friday at 9:28 PM

I hate to bother asking for it, but the data I'm seeing for these bullet/powder combos seems to vary a fair bit, depending on the source. So I guess I should see what QL has to say.

Hornady case, 47.1gr water
WLR primer

#1 - 130gr Sierra Tipped GameKing (Gamechanger), #4330
Ramshot Big Game powder

#2 - 130gr Sierra GKHP, #1728
Winchester StaBall 6.5 powder

Thanks in advance,
Brian

jimbires · Saturday at 2:13 AM

Code:

Cartridge          : 6.5 Creedmoor Hornady
Bullet             : .264, 130, Sierra TGK 4330
Useable Case Capaci: 42.240 grain H2O = 2.743 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Ramshot Big Game

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0   77    32.00   2286    1508   32954   8155     94.7    1.446
-18.0   79    32.80   2340    1581   35165   8377     95.6    1.407
-16.0   81    33.60   2394    1655   37509   8589     96.5    1.367
-14.0   83    34.40   2448    1730   40038   8789     97.3    1.327
-12.0   85    35.20   2502    1807   42725   8976     98.0    1.287
-10.0   87    36.00   2555    1885   45596   9149     98.5    1.250
-08.0   89    36.80   2608    1964   48662   9308     99.0    1.213
-06.0   91    37.60   2661    2044   51917   9452     99.4    1.179
-04.0   93    38.40   2714    2126   55371   9579     99.7    1.145  ! Near Maximum !
-02.0   94    39.20   2766    2208   59057   9691     99.9    1.113  ! Near Maximum !
+00.0   96    40.00   2818    2292   62992   9785    100.0    1.082  !DANGEROUS LOAD-DO NOT USE!
+02.0   98    40.80   2869    2376   67198   9864    100.0    1.052  !DANGEROUS LOAD-DO NOT USE!
+04.0  100    41.60   2920    2460   71696   9938    100.0    1.023  !DANGEROUS LOAD-DO NOT USE!
+06.0  102    42.40   2970    2546   76513  10008    100.0    0.995  !DANGEROUS LOAD-DO NOT USE!
+08.0  104    43.20   3020    2633   81676  10076    100.0    0.968  !DANGEROUS LOAD-DO NOT USE!
+10.0  106    44.00   3070    2720   87218  10140    100.0    0.942  !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     96    40.00   2917    2457   75226   9384    100.0    1.009  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     96    40.00   2669    2056   51070   9924     97.1    1.179

Code:

Cartridge          : 6.5 Creedmoor Hornady
Bullet             : .264, 130, Sierra HP GK 1728
Useable Case Capaci: 44.205 grain H2O = 2.870 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Winchester 6,5 StaBall *T*C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0   82    36.08   2247    1457   31693   8087     95.5    1.462
-18.0   84    36.98   2302    1530   33890   8308     96.5    1.421
-16.0   86    37.88   2358    1605   36245   8516     97.3    1.380
-14.0   88    38.79   2413    1681   38773   8710     98.1    1.337
-12.0   91    39.69   2468    1759   41488   8887     98.7    1.296
-10.0   93    40.59   2524    1838   44407   9048     99.2    1.255
-08.0   95    41.49   2579    1919   47549   9190     99.6    1.216
-06.0   97    42.39   2633    2001   50937   9314     99.8    1.179
-04.0   99    43.30   2688    2085   54591   9417    100.0    1.143  ! Near Maximum !
-02.0  101    44.20   2742    2170   58539   9501    100.0    1.108  ! Near Maximum !
+00.0  103    45.10   2795    2255   62814   9579    100.0    1.075  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    46.00   2849    2342   67439   9654    100.0    1.043  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    46.90   2902    2431   72482   9724    100.0    1.011  !DANGEROUS LOAD-DO NOT USE!
+06.0  109    47.81   2955    2520   77960   9790    100.0    0.981  !DANGEROUS LOAD-DO NOT USE!
+08.0  111    48.71   3008    2611   83938   9852    100.0    0.952  !DANGEROUS LOAD-DO NOT USE!
+10.0  113    49.61   3060    2704   90477   9909    100.0    0.923  !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    103    45.10   2892    2414   75479   9231    100.0    1.003  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    45.10   2649    2025   51508   9822     98.2    1.170

bdbrown66 · Saturday at 6:45 AM

Thanks, Jim. On that data, what would you consider to be the max? The row at Step 0.0? Or the row above that, which is the last "Near max"?

jimbires · Saturday at 8:39 AM

the 6.5 creedmoor is rated at 63091 PSI . yes , the 0.0 line would be considered a max load .

I assumed a 22" BBL . pressures would be the same , velocity would be different with a different length BBL .

bdbrown66 · Saturday at 9:15 AM

jimbires said:
the 6.5 creedmoor is rated at 63091 PSI . yes , the 0.0 line would be considered a max load .

I assumed a 22" BBL . pressures would be the same , velocity would be different with a different length BBL .

Mine is a 24", but I'll measure velocity with my Garmin anyway. Thanks for running the numbers.

Just for comparison, here is what various sources list as a max load for 130gr bullets for these two powders:

Big Game
Nosler 43.0
Hornady 41.8
Hodgdon 40.5
QL 40.0

Staball 6.5
Hornady 45.5
Hodgdon 44.3
QL 45.1

I think I'll set a max of 41.0 for Big Game and 45.0 for StaBall and work up slowly.

jimbires · Sunday at 4:53 AM

your case water capacity of 47.1 grains is less than quickload has for the default capacity of 51.5 grain . this will lower your powder charge .
as always start low and work up , while watching for pressure .

bdbrown66 · Sunday at 5:25 AM

jimbires said:
your case water capacity of 47.1 grains is less than quickload has for the default capacity of 51.5 grain . this will lower your powder charge .
as always start low and work up , while watching for pressure .

I'm not too sure about that number. I didn't measure it myself, it came from the Nosler load data for their 130gr bullets. But then I noticed that the number was different on their load data for other bullet weights, so I have no idea what to make of that. To me, case capacity is independent of any bullet choice. I guess maybe they are basing it on capacity when the bullet is seated to their nominal depth.

SJB358 · Sunday at 5:28 AM

bdbrown66 said:
I'm not too sure about that number. I didn't measure it myself, it came from the Nosler load data for their 130gr bullets. But then I noticed that the number was different on their load data for other bullet weights, so I have no idea what to make of that. To me, case capacity is independent of any bullet choice. I guess maybe they are basing it on capacity when the bullet is seated to their nominal depth.

They’re measuring case capacity with a bullet seated to their OAL.

jimbires · Sunday at 5:37 AM

bdbrown66 said:
I'm not too sure about that number. I didn't measure it myself, it came from the Nosler load data for their 130gr bullets. But then I noticed that the number was different on their load data for other bullet weights, so I have no idea what to make of that. To me, case capacity is independent of any bullet choice. I guess maybe they are basing it on capacity when the bullet is seated to their nominal depth.

Nosler gives the usable case capacity , with a seated bullet . this is not the case capacity quickload uses .

to measure your case capacity ; take a fired case , do not resize it , let the primer in it . weigh this case . fill the case with water , to the top . fill it so it's flat even with the neck . not bubbled up , not concaved . if you get a little bubble on top , or a dripper down the side, touch it with the corner of a paper towel . weigh it again . subtract the two numbers and you have your case capacity . dry the case .

if you would want to measure the case capacity , I'll run the numbers again for you . I'll even use a 24" BBL . LOL