H4831SC / RL 19 for 6.5 Creedmore

[TackDriver284]

I am doing a load development for my new custom built 6.5 Creedmore with Surgeon action and a 30 inch Shilen Match barrel. I did the ladder test on the 130 and 140 grain bullets. I used H4350 it does also show some promising loads of 4 rounds of 130 grain into .160 MOA at 100 yards on my first day of testing with 41 grains of H4350 and its a mild load at 2800 fps. I have not given up yet, still need to do my 2nd day of testing.

I was wondering since the H4831SC is a very non sensitive powder and worked wonders on my 6.5 X 284 and it is not listed in the Creedmore listed choice of powders. I was wondering if any of you have tried H4831SC and RL 19in the 6.5 Creedmore? I am reluctant to try if its not listed, hopefully someone can chime in.

 

[DrMike]

Welcome to the forum. It sounds as if you have a shooter on your hands. You certainly have chosen some quality components. The load you describe with H4350 is definitely mild; you do have some room to grow.

Cartridge : 6.5 Creedmoor ...657 2037 40243 6861 92.2 1.591

Cartridge : 6.5 Creedmoor Hornady
Bullet : .264, 130, Nosler AccuBond 56902
Useable Case Capaci: 47.584 grain H2O = 3.090 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 30.0 inch = 762.0 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 62000 psi, or 427 MPa
or a maximum loading ratio or filling of 110 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

7 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.

Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
Alliant Reloder-26                 108.1     51.0     3.30    3228   100.0    62000    8576   1.290  ! Near Maximum !
Norma MRP                          108.7     49.8     3.23    3195    99.9    62000    8702   1.294  ! Near Maximum !
Vihtavuori N560                    110.0     49.3     3.19    3166    98.0    61258    8870   1.301  ! Near Maximum !
IMR 7828 SSC                       108.4     48.9     3.17    3146    98.3    62000    8542   1.292  ! Near Maximum !
Accurate MAGPRO                    110.0     51.3     3.32    3145    96.6    60512    8879   1.313  ! Near Maximum !
Alliant Reloder-22                 110.0     48.8     3.16    3137    99.2    60528    8536   1.313  ! Near Maximum !
Alliant Reloder-17                  97.7     44.9     2.91    3131   100.0    62000    7642   1.301  ! Near Maximum !
Ramshot Magnum                     109.7     52.4     3.40    3115    99.6    62000    8112   1.297  ! Near Maximum !
Alliant Reloder-19                 106.9     46.9     3.04    3102    99.2    62000    8143   1.307  ! Near Maximum !
Ramshot Hunter                     102.4     46.4     3.00    3101   100.0    62000    7872   1.312  ! Near Maximum !
Winchester 760                      96.7     44.8     2.91    3095    99.9    62000    7879   1.315  ! Near Maximum !
Hodgdon H414                        96.7     44.8     2.91    3095    99.9    62000    7879   1.315  ! Near Maximum !
Vihtavuori N550                     99.0     44.3     2.87    3078   100.0    62000    7630   1.325  ! Near Maximum !
Accurate 4350                      101.2     44.4     2.88    3073   100.0    62000    7464   1.336  ! Near Maximum !
Norma 204                          101.3     45.9     2.97    3071    99.0    62000    7912   1.311  ! Near Maximum !
Hodgdon H4831 SC                   107.8     47.8     3.10    3063    97.5    62000    7985   1.308  ! Near Maximum !
IMR 4831                           107.0     44.9     2.91    3056   100.0    62000    7331   1.330  ! Near Maximum !
Winchester WXR                     110.0     47.7     3.09    3051    98.4    54995    8406   1.369  ! Near Maximum !
Winchester Supreme 780             105.1     48.6     3.15    3045    99.0    62000    7705   1.315  ! Near Maximum !
Alliant Reloder-23                 110.0     47.2     3.06    3035   100.0    54741    7628   1.373  ! Near Maximum !
Accurate 3100                      110.0     48.3     3.13    3034   100.0    60568    7503   1.352  ! Near Maximum !
Hodgdon Hybrid 100V                104.6     44.4     2.88    3028   100.0    62000    6879   1.322  ! Near Maximum !
Hodgdon H380                        93.9     42.1     2.73    3025   100.0    62000    7246   1.336  ! Near Maximum !
Norma 203 old                       94.4     41.8     2.71    3015   100.0    62000    6969   1.346  ! Near Maximum !
IMR 4007 SSC                        95.6     42.5     2.76    3003    99.5    62000    7351   1.334  ! Near Maximum !
Hodgdon H4831                      110.0     46.9     3.04    3002    96.9    57756    7866   1.348  ! Near Maximum !
Vihtavuori N165                    110.0     47.7     3.09    2969    98.9    56786    7454   1.368  ! Near Maximum !
Accurate 4064                       94.0     40.3     2.61    2967   100.0    62000    6513   1.371  ! Near Maximum !
Vihtavuori N160                    110.0     46.3     3.00    2953    97.5    57781    7424   1.362  ! Near Maximum !

QL projects that H4831SC would work for you, though it does not give the highest velocity or meet other criteria as well as other powders.

Boosting the charge to near maximum does up the velocity quite a bit, and may allow for refinement on other powders.

Cartridge          : 6.5 Creedmoor Hornady
Bullet             : .264, 130, Nosler AccuBond 56902
Useable Case Capaci: 47.584 grain H2O = 3.090 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 30.0 inch = 762.0 mm
Powder             : Hodgdon H4350

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   83    35.61   2466    1755   32696   6130     92.9    1.746
-18.0   85    36.50   2522    1836   34855   6298     93.9    1.700
-16.0   87    37.39   2578    1919   37153   6460     94.8    1.655
-14.0   89    38.28   2635    2004   39603   6615     95.7    1.609
-12.0   91    39.17   2691    2090   42196   6761     96.4    1.563
-10.0   93    40.06   2746    2177   44935   6900     97.1    1.519
-08.0   95    40.95   2802    2266   47848   7029     97.8    1.478
-06.0   97    41.84   2857    2356   50951   7149     98.3    1.438
-04.0  100    42.73   2912    2447   54258   7259     98.8    1.399  ! Near Maximum !
-02.0  102    43.62   2966    2540   57784   7359     99.2    1.361  ! Near Maximum !
+00.0  104    44.51   3020    2633   61549   7448     99.5    1.325  ! Near Maximum !
+02.0  106    45.40   3074    2728   65570   7525     99.8    1.291  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    46.29   3127    2823   69869   7591     99.9    1.257  !DANGEROUS LOAD-DO NOT USE!
+06.0  110    47.18   3180    2920   74471   7644    100.0    1.225  !DANGEROUS LOAD-DO NOT USE!
+08.0  112    48.07   3233    3017   79402   7687    100.0    1.193  !DANGEROUS LOAD-DO NOT USE!
+10.0  114    48.96   3285    3115   84694   7725    100.0    1.163  !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    104    44.51   3128    2825   72441   7165    100.0    1.243  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    44.51   2866    2371   50856   7427     95.5    1.434

 

[TackDriver284]

Thanks for the response. The 41 grains was the shooter at about .160 MOA with 4 in one, but I have tried up to 42.6 grains and groups open up to an inch. The other load which is 41.8 grains shot 3 in one hole and one round about a third of an inch above the hole. The 3 in 1 measured about .1 MOA. Not sure why the flyer was a half inch above on the 4th shot. Could be shooter error, there was some mirage there too. I may try those two loads again and tweak the bullet seating depth off the lands another .010 and a change of primers. Using Hornady brass and Fed 210 Match. I have some Norma brass that I never tried.

I have some confusion on barrel time on the post that you sent. I know that the barrel is like a tuning fork, just need to be in the perfect spot to be accurate. The numbers is what I have confusion with, just don't understand what the numbers have in terms of trying to find the perfect node.

The last pic on the list of powders,,,are those powders not recommended? I see over 100% on powder fill, including the H4831SC, so it will not work with this powder? Maybe you can help me here, thanks

 

[Dwh7271]

Fwiw, I run H4831SC in a 260 AI as my preferred powder. Accuracy is excellent with it. I only mention it as case capacities between the two cartridges are fairly close.

 

[Horsethief]

I've used 43gn of H-4831SC with the 140gn Hornady Match bullets. I think the average velocity was 2640fps but I'm not sure. I was looking for a 1,000 yard load with the 140 Match bullets. Superformance is too wishy washy with variances in velocity with that bullet.