Quickload Request
- Thread starter Gandhi
- Start date
The information you have given is incomplete for anyone to help out.
What info are you looking for? Velocity for a certain load? Whether a load may be safe or not?
Other info you should supply:
What powder and powder charge are you wondering about? (No one is going to go through every available powder and every available charge for you)
Case capacity of H2O in grains?
Length of bullet from base to tip? (Lots change and quickload bullet data may not be accurate)
COAL with intended bullet?
What info are you looking for? Velocity for a certain load? Whether a load may be safe or not?
Other info you should supply:
What powder and powder charge are you wondering about? (No one is going to go through every available powder and every available charge for you)
Case capacity of H2O in grains?
Length of bullet from base to tip? (Lots change and quickload bullet data may not be accurate)
COAL with intended bullet?
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Ah Yes! So Sorry!
I am using Winchester 760.
COAL: 2.010in Average over four cases.
Case Vol: 56.7 gr of H2O
I would like to know an approximate powder charge to start at. I want to start with a medium load and work up to a higher load. Knowing relevant velocity data and pressure data wold be great too!
Regards!
I am using Winchester 760.
COAL: 2.010in Average over four cases.
Case Vol: 56.7 gr of H2O
I would like to know an approximate powder charge to start at. I want to start with a medium load and work up to a higher load. Knowing relevant velocity data and pressure data wold be great too!
Regards!
Not OAL of case, OAL of loaded round (affects case capacity and pressure) Make a dummy round if necessary to your intended OAL and measure tip of bullet to base of case.
Still need to know which powder you intend to use as there are many that would be considered appropriate.
Also (again) bullet length. tip to base.
Still need to know which powder you intend to use as there are many that would be considered appropriate.
Also (again) bullet length. tip to base.
Go to the Hodgdon's website and look up the data for the 208 grain Hornady A-Max for your estimates and start loads.
Quickload went a little flaky with the Hornady 9th edition and their load data and your bullet request. *You get the best data when you combine a chronograph with Quickload. When I fed the data from Hodgdon's website into Quickload the chamber pressures a velocity's matched better than the Hornady manual.
*Calibrate QuickLoad to match your range measured velocity data by changing the burning rate factor (Ba) and the bullet weight
Bottom line, Quickload is only a guesstimate and Hodgdons is actual pressure data from a rifle and not a software guess.
Quickload went a little flaky with the Hornady 9th edition and their load data and your bullet request. *You get the best data when you combine a chronograph with Quickload. When I fed the data from Hodgdon's website into Quickload the chamber pressures a velocity's matched better than the Hornady manual.
*Calibrate QuickLoad to match your range measured velocity data by changing the burning rate factor (Ba) and the bullet weight
Bottom line, Quickload is only a guesstimate and Hodgdons is actual pressure data from a rifle and not a software guess.
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I'm using W-760 powder, atleast that's what I'd used for my 178gr HPBTs. Managed to get 45.5gr of W-760 produced beneath 1/4MOA at 100M at 2570fps. However, Hodgdon's doesnt show a loading for 208gr using W-760.
Simpler to just buy the necessary powder?
Powder: Winchester 760 aka W-760
Bullet: Hornady 208gr HPBT .308 dia
OAL w/ intended bullet: 2.820 in (tip to base)
Simpler to just buy the necessary powder?
Powder: Winchester 760 aka W-760
Bullet: Hornady 208gr HPBT .308 dia
OAL w/ intended bullet: 2.820 in (tip to base)
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Cartridge : .308 Win.
Bullet : .308, 208, Hornady BTHP 30733
Useable Case Capaci: 44.186 grain H2O = 2.869 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Winchester 760
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 36.00 2033 1908 30042 5479 88.8 1.769
-18.0 86 36.90 2084 2005 32113 5651 90.1 1.721
-16.0 88 37.80 2135 2104 34333 5817 91.3 1.675
-14.0 90 38.70 2186 2206 36717 5978 92.4 1.630
-12.0 92 39.60 2237 2311 39279 6131 93.4 1.582
-10.0 94 40.50 2288 2418 42037 6277 94.4 1.534
-08.0 96 41.40 2339 2527 45004 6415 95.3 1.488
-06.0 98 42.30 2390 2639 48206 6544 96.1 1.444
-04.0 100 43.20 2442 2753 51662 6664 96.9 1.402 ! Near Maximum !
-02.0 102 44.10 2493 2870 55399 6774 97.5 1.361 ! Near Maximum !
+00.0 104 45.00 2544 2989 59446 6873 98.1 1.321 ! Near Maximum !
+02.0 107 45.90 2595 3110 63835 6961 98.6 1.283 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 46.80 2646 3233 68606 7038 99.1 1.246 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 47.70 2697 3359 73803 7102 99.4 1.210 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 48.60 2747 3486 79473 7153 99.7 1.175 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 49.50 2798 3616 85669 7191 99.9 1.142 !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 45.00 2660 3268 72392 6656 100.0 1.228 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 45.00 2384 2624 48007 6717 92.0 1.444
The 208 grain, Hornady BTHP 30733 gives very different chamber pressure readings compared to the 208 A-Max bullet for the same powder charge. 59,446 psi vs 52,079 psi. (heads up and be careful) these are "software estimates"
Cartridge : .308 Win.
Bullet : .308, 208, Hornady A-MAX 30712
Useable Case Capaci: 46.825 grain H2O = 3.040 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Winchester 760
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 79 36.00 1988 1825 27391 5513 87.8 1.829
-18.0 81 36.90 2037 1916 29173 5692 89.1 1.783
-16.0 83 37.80 2086 2009 31092 5866 90.3 1.737
-14.0 85 38.70 2135 2105 33134 6036 91.4 1.693
-12.0 87 39.60 2184 2204 35317 6199 92.5 1.651
-10.0 89 40.50 2234 2304 37649 6356 93.5 1.606
-08.0 91 41.40 2283 2407 40147 6507 94.4 1.560
-06.0 93 42.30 2332 2512 42823 6649 95.3 1.515
-04.0 95 43.20 2382 2619 45689 6784 96.1 1.472
-02.0 97 44.10 2431 2729 48771 6910 96.8 1.431
+00.0 99 45.00 2480 2840 52079 7027 97.5 1.391 ! Near Maximum !
+02.0 101 45.90 2529 2954 55638 7134 98.1 1.352 ! Near Maximum !
+04.0 103 46.80 2578 3069 59472 7231 98.6 1.314 !DANGEROUS LOAD-DO NOT USE!
+06.0 104 47.70 2627 3187 63605 7317 99.0 1.278 !DANGEROUS LOAD-DO NOT USE!
+08.0 106 48.60 2675 3306 68073 7391 99.3 1.243 !DANGEROUS LOAD-DO NOT USE!
+10.0 108 49.50 2724 3427 72890 7454 99.6 1.209 !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 99 45.00 2599 3121 63253 6882 100.0 1.290 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 45.00 2319 2484 42167 6796 90.8 1.521
I used the Hornady 9th addition 2.800 OAL for above data
NOTE: you edited your post "OAL w/ intended bullet: 2.820 in (tip to base)" lowered pressures to 58,250 psi and 51,203 psi
Bullet : .308, 208, Hornady BTHP 30733
Useable Case Capaci: 44.186 grain H2O = 2.869 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Winchester 760
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 36.00 2033 1908 30042 5479 88.8 1.769
-18.0 86 36.90 2084 2005 32113 5651 90.1 1.721
-16.0 88 37.80 2135 2104 34333 5817 91.3 1.675
-14.0 90 38.70 2186 2206 36717 5978 92.4 1.630
-12.0 92 39.60 2237 2311 39279 6131 93.4 1.582
-10.0 94 40.50 2288 2418 42037 6277 94.4 1.534
-08.0 96 41.40 2339 2527 45004 6415 95.3 1.488
-06.0 98 42.30 2390 2639 48206 6544 96.1 1.444
-04.0 100 43.20 2442 2753 51662 6664 96.9 1.402 ! Near Maximum !
-02.0 102 44.10 2493 2870 55399 6774 97.5 1.361 ! Near Maximum !
+00.0 104 45.00 2544 2989 59446 6873 98.1 1.321 ! Near Maximum !
+02.0 107 45.90 2595 3110 63835 6961 98.6 1.283 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 46.80 2646 3233 68606 7038 99.1 1.246 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 47.70 2697 3359 73803 7102 99.4 1.210 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 48.60 2747 3486 79473 7153 99.7 1.175 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 49.50 2798 3616 85669 7191 99.9 1.142 !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 45.00 2660 3268 72392 6656 100.0 1.228 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 45.00 2384 2624 48007 6717 92.0 1.444
The 208 grain, Hornady BTHP 30733 gives very different chamber pressure readings compared to the 208 A-Max bullet for the same powder charge. 59,446 psi vs 52,079 psi. (heads up and be careful) these are "software estimates"
Cartridge : .308 Win.
Bullet : .308, 208, Hornady A-MAX 30712
Useable Case Capaci: 46.825 grain H2O = 3.040 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Winchester 760
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 79 36.00 1988 1825 27391 5513 87.8 1.829
-18.0 81 36.90 2037 1916 29173 5692 89.1 1.783
-16.0 83 37.80 2086 2009 31092 5866 90.3 1.737
-14.0 85 38.70 2135 2105 33134 6036 91.4 1.693
-12.0 87 39.60 2184 2204 35317 6199 92.5 1.651
-10.0 89 40.50 2234 2304 37649 6356 93.5 1.606
-08.0 91 41.40 2283 2407 40147 6507 94.4 1.560
-06.0 93 42.30 2332 2512 42823 6649 95.3 1.515
-04.0 95 43.20 2382 2619 45689 6784 96.1 1.472
-02.0 97 44.10 2431 2729 48771 6910 96.8 1.431
+00.0 99 45.00 2480 2840 52079 7027 97.5 1.391 ! Near Maximum !
+02.0 101 45.90 2529 2954 55638 7134 98.1 1.352 ! Near Maximum !
+04.0 103 46.80 2578 3069 59472 7231 98.6 1.314 !DANGEROUS LOAD-DO NOT USE!
+06.0 104 47.70 2627 3187 63605 7317 99.0 1.278 !DANGEROUS LOAD-DO NOT USE!
+08.0 106 48.60 2675 3306 68073 7391 99.3 1.243 !DANGEROUS LOAD-DO NOT USE!
+10.0 108 49.50 2724 3427 72890 7454 99.6 1.209 !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 99 45.00 2599 3121 63253 6882 100.0 1.290 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 45.00 2319 2484 42167 6796 90.8 1.521
I used the Hornady 9th addition 2.800 OAL for above data
NOTE: you edited your post "OAL w/ intended bullet: 2.820 in (tip to base)" lowered pressures to 58,250 psi and 51,203 psi
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