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are there any quickload users that feel like checking the below for me?
6.5 creedmoor
Hornady brass - i believe 53.5 gr h20
142gr smk 72.5mm oal
Reloader 16 powder
Curious about how the theorized data maps against my loads from today
Thanks in advance
barrel length ??
Knew I missed something, 22 inch
Cartridge : 6.5 Creedmoor Hornady
Bullet : .264, 142, Sierra HPBT MatchK 1742 G7 Litz
Useable Case Capaci: 47.951 grain H2O = 3.113 cm³
Cartridge O.A.L. L6: 2.854 inch = 72.50 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Alliant Reloder-16
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 80 34.40 2230 1568 30742 9161 96.0 1.558
-18.0 82 35.26 2284 1645 32803 9404 96.9 1.517
-16.0 84 36.12 2337 1722 34992 9633 97.6 1.477
-14.0 86 36.98 2391 1802 37329 9846 98.3 1.437
-12.0 88 37.84 2443 1882 39824 10043 98.9 1.394
-10.0 90 38.70 2496 1964 42489 10222 99.3 1.353
-08.0 92 39.56 2548 2047 45336 10381 99.7 1.313
-06.0 94 40.42 2600 2131 48349 10522 99.9 1.275
-04.0 96 41.28 2651 2216 51540 10642 100.0 1.238
-02.0 98 42.14 2702 2302 54934 10744 100.0 1.203 ! Near Maximum !
+00.0 100 43.00 2752 2388 58548 10842 100.0 1.169 ! Near Maximum !
+02.0 102 43.86 2802 2475 62397 10937 100.0 1.136 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 44.72 2851 2563 66500 11028 100.0 1.105 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 45.58 2900 2651 70876 11117 100.0 1.075 !DANGEROUS LOAD-DO NOT USE!
Thanks @Tentman my magnetospeed was saying that 43.5 gave an average of 2699, given its not standard OAL i was curious about how it sat theoretically against things like quickload predictions. Alliant data gives amax of 43.9 gr with an OAl of 2.8" which i would have thought would give more pressure being shorter, seems they are more ok with higher pressure?
Q/L is a guide only and needs good input data to give good results, usually with good inputs it should be within 15-40 fps. Is the case capacity you gave from a case fired in your rifle then measured?? Q/L (and GRT) do show significant effects on changing COAL but in practise it seems to be a bit less especially with the "pointy" bullets being used these days . . .
And just to make your day, I think my V2 magnetospeed has been giving me slow readings, I really must get it calibrated . . .
Thats my other consideration, seem to have to bump speeds up in ballistics apps when in the field and its missing a few shots (v3 bayonet after the lost one got a love bite)Quote:
Originally Posted by Tentman
@Tentman I Re-did water volume and got 53.5gr