300 PRC and quickload?

FOTIS · Sep 22, 2020

I ran a sim in Q/L with the 212 ELDX and VN 570. It listed a max of 91 grains (103% loading density) and about 3050 fps or so. I loaded the powder in the case and it was full to the brim! I did not seat a bullet!
After doing some "Fotis" work in my head, based on previous experience and extrapolation I decided on 81 grains.....don't ask how I came up with it.

81 gr gave me almost max pressures and 3005 fps. I have never seen Q/L be that far off!

Anyone try to try this in Q/L and see where I went wrong n Q/L? if I did something wrong that is! :?:

TackDriver284 · Sep 22, 2020

Did you change the weighing factor to .33 for overbore cartridges? Have you found the H20 case capacity and adjust the numbers? I can't find 300 PRC in my 3.9 version, what is your version?

DrMike · Sep 22, 2020

When I ran QL just now, it matches what you said you got.

Code:

Cartridge          : .300 Precision Rifle Cartridge
Bullet             : .308, 212, Hornady ELD-X 3077 G7
Useable Case Capaci: 90.905 grain H2O = 5.902 cm³
Cartridge O.A.L. L6: 3.700 inch = 93.98 mm
Barrel Length      : 24.4 inch = 619.8 mm
Powder             : Vihtavuori N570 *C

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   93    81.90   2686    3396   43990  14502     94.1    1.476
-09.0   94    82.81   2721    3484   45624  14692     94.7    1.450
-08.0   95    83.72   2755    3573   47327  14876     95.2    1.425
-07.0   96    84.63   2790    3663   49099  15053     95.8    1.400
-06.0   97    85.54   2824    3755   50944  15224     96.3    1.376
-05.0   98    86.45   2859    3848   52867  15387     96.8    1.353
-04.0   99    87.36   2894    3942   54859  15542     97.2    1.330
-03.0  100    88.27   2929    4037   56920  15690     97.6    1.307  ! Near Maximum !
-02.0  101    89.18   2963    4133   59060  15829     98.0    1.284  ! Near Maximum !
-01.0  102    90.09   2998    4231   61285  15960     98.4    1.263  ! Near Maximum !
+00.0  103    91.00   3033    4329   63598  16083     98.7    1.241  ! Near Maximum !
+01.0  104    91.91   3067    4429   66004  16196     99.0    1.220  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    92.82   3102    4529   68507  16300     99.2    1.199  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    93.73   3136    4631   71113  16395     99.4    1.179  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    94.64   3171    4733   73825  16480     99.6    1.159  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    95.55   3205    4837   76651  16554     99.8    1.139  !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    91.00   3200    4819   79111  15572    100.0    1.132  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    91.00   2800    3690   49267  15514     91.8    1.386

FOTIS · Sep 22, 2020

See? It is nuts!

300 PRC and quickload?

FOTIS

Range Officer

TackDriver284

Handloader

DrMike

Ballistician

FOTIS

Range Officer

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