QuickLoad Request Please

[.300winmag]

Hey fella's,

I lent my chronograph to a buddy this past weekend and got it returned with a bullet hole right through it. Haha, he felt terrible but it's no big deal, I'll just have to send it in. Anyway, I was planning on going out tomorrow to chronograph a few more loads with my .300 and can't now. I was hoping one of you kind gentlemen would be willing to run Quickload for me so I can get an idea of my velocity with the new loads. It will also be interesting to compare the Quickload projections to the velocities I recorded a few weeks ago through the chronograph.

The specs are as followed:

.300 Win. Mag
215gr Berger Hybrid Bullet
3.675" Overall cartridge length
28" Barrel
H-1000 Powder
5 cases measured for case volume averaged 92.22grs H20 (was very surprised at the consistency of the case volumes) Filled to the top of the neck

I chronographed 10 of these cartridges a few weekends ago with 76.0grs of H-1000 and they averaged 2,885 FPS, ES=12. Really curious what my loads at 77.0grs are doing. They are shooting just as well as my 76.0 gr load and still no heavy bolt lift, flattened primers, cratered primers or ejector marks. This is as high as I will be going though, don't want to kill my brass.

Thanks in advance!

 

[DrMike]

Cartridge : .300 Win. Mag.(W)
Bullet : .308, 215, Berger Hybrid G7 #30423
Useable Case Capaci: 83.395 grain H2O = 5.415 cm³
Cartridge O.A.L. L6: 3.675 inch = 93.35 mm
Barrel Length : 28.0 inch = 711.2 mm
Powder : Hodgdon H1000

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 84 63.92 2346 2629 30581 9014 93.9 1.837
-18.0 86 65.52 2407 2767 32729 9280 95.1 1.789
-16.0 88 67.12 2468 2908 35037 9530 96.1 1.741
-14.0 90 68.71 2529 3054 37518 9763 97.1 1.690
-12.0 92 70.31 2590 3203 40188 9976 97.9 1.636
-10.0 95 71.91 2651 3355 43054 10168 98.6 1.583
-08.0 97 73.51 2712 3510 46164 10337 99.2 1.533
-06.0 99 75.11 2772 3668 49511 10483 99.6 1.484
-04.0 101 76.70 2832 3829 53127 10604 99.8 1.437 ! Near Maximum !
-02.0 103 78.30 2892 3992 57041 10699 100.0 1.392 ! Near Maximum !
+00.0 105 79.90 2951 4157 61285 10770 100.0 1.348 ! Near Maximum !
+02.0 107 81.50 3010 4324 65891 10835 100.0 1.306 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 83.10 3068 4493 70903 10895 100.0 1.265 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 84.69 3126 4665 76364 10950 100.0 1.226 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 86.29 3184 4838 82330 11000 100.0 1.188 !DANGEROUS LOAD-DO NOT USE!
+10.0 116 87.89 3241 5015 88861 11044 100.0 1.151 !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 105 79.90 3067 4491 75070 10293 100.0 1.248 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 79.90 2773 3672 49396 11000 97.2 1.481

 

[.300winmag]

Than you very much DrMike! I appreciate it immensely!

The QL data was within less than 3% of my measured velocities! Pretty darn good!

I made a plot on MathCAD using the data QuickLoad provided and was surprised to find that the velocity increase was a linear progression when compared to powder charge. I applied an equation to the data and found that a linear equation had a fit of 99.9%. Knowing that it was indeed linear, a simple correction coefficient can be applied to the QuickLoad data to make it fit real-world results. By doing this with my known 76.0 gr, load velocity, I determined that 77.0 grs of H-1000 should yield approximately 2,924 FPS. If it had not been linear, my computer would have to be doing overtime right now!

Will be going out shooting tomorrow, will post results; good or bad.

Thank you again for your help! The knowledge, kind heartedness and fun on this forum is why I stay here. This is by far my favorite forum, no other forum compares to the group of people who are on this site!

 

[DrMike]

I'm not surprised at your find; after all, the QL data is nothing but mathematics. The more accurate the input data, the more accurate the projection. Good stuff. And I agree that the people hanging out here are first-rate.

 

[SJB358]

Very cool. It is amazing how well QL does with good inputs though.

 

[steve4102]

 Cartridge          : .300 Win. Mag.(W)
Bullet             : .308, 215, Berger Hybrid G7 #30423
Cartridge O.A.L. L6: 3.675 inch or 93.35 mm
Barrel Length      : 28.0 inch or 711.2 mm
Powder             : Hodgdon H1000

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   81    61.60   2259    2435   27721   8602     91.9    1.916
-18.0   83    63.14   2317    2563   29586   8879     93.2    1.866
-16.0   85    64.68   2375    2694   31584   9142     94.4    1.816
-14.0   87    66.22   2434    2828   33722   9392     95.5    1.768
-12.0   89    67.76   2493    2967   36013   9626     96.5    1.721
-10.0   91    69.30   2552    3108   38474   9843     97.4    1.670
-08.0   93    70.84   2610    3253   41115  10041     98.2    1.619
-06.0   95    72.38   2669    3400   43952  10220     98.8    1.568
-04.0   97    73.92   2727    3551   47002  10377     99.3    1.520
-02.0   99    75.46   2785    3704   50288  10512     99.6    1.474
+00.0  101    77.00   2843    3859   53828  10624     99.9    1.429  ! Near Maximum !
+02.0  103    78.54   2901    4017   57652  10711    100.0    1.385  ! Near Maximum !
+04.0  105    80.08   2958    4176   61785  10778    100.0    1.343  !DANGEROUS LOAD-DO NOT USE!
+06.0  107    81.62   3014    4337   66260  10839    100.0    1.303  !DANGEROUS LOAD-DO NOT USE!
+08.0  109    83.16   3070    4500   71113  10897    100.0    1.264  !DANGEROUS LOAD-DO NOT USE!
+10.0  111    84.70   3126    4665   76385  10950    100.0    1.226  !DANGEROUS LOAD-DO NOT USE!