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While this morning's 10mm/180gr Nosler bone test was a flop; here's a test that went very, very well for the handloaded 10mm/180gr Gold Dot. Now that Double Tap ammunition no longer loads Gold Dot bullets, if one wants to carry a bonded bullet in 10mm, then it'll need to be handloaded.
The set-up for this test was a double 1.5mm steel barrier plus a cow bone;
Big bone, while not thick, very hard barrier;
Muzzle velocity of the 180gr Gold Dot was 1267fps, expansion 0.582"
Bullet held together (177.1grs), nice test;
Baseline 4LD for the 10mm/180gr Gold Dot was;
10mm 180 gr. Speer Gold Dot JHP v. 4 layers of denim
Vi = 1267 feet per second
Dr = 0.614 inch
Mr= 178.3 grains
Vc = 122.790 meters per second (402.855 feet per second)
Mw = 58.041 grams (2.047 ounces)
Xcm = 40.939 centimeters (16.118 inches)
Bob
Using the equations provided here ( http://www.wbdg.org/ccb/DOD/UFC/ufc_4_023_07.pdf ) for determining the ballistic limit (V50) and residual velocity (Vr) against steel targets and the data provided above, it is possible to estimate the residual velocity of the exiting 10mm 180 gr. Gold Dot and get a good idea of its potential for penetration in soft tissue.
Using two separate thicknesses of 1.5mm CRS panel having a BHN of ~149, the residual velocity of the Speer 10mm 180 gr. Gold Dot would be 820.931 feet per second assuming (immediate) expansion to full recovered diameter (0.582") upon impact with the first of the two 1.5mm CRS panels.
Penetration depth and permanent wound cavity mass may then be predicted using the MacPherson model-
Speer 10mm 180 gr. Gold Dot JHP v. two 1.5mm CRS panels
Recovered Projectile Data:
Recovered Diameter: 0.582" (1.455x caliber))
Retained Mass: 177.1 gr.
Impact Velocity: 1267 fps (Vr: 820.931 fps)
Predicted Performance:
Cavitation Regime Boundary (Vc) = 406.631 fps
Permanent Wound Cavity Mass (Mw) = 45.467 grams (1.604 ounces)
Penetration Depth (Xcm) = 36.143 cm (14.230 inches)
I am not sure that there is an equation/algorithm that would permit an estimate/prediction of residual ballistic velocity through bone (much less dried up cow bone) and even if we had such an animal, I'd find it suspect under such circumstances.
Thanks for the test, Bob.
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