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Home > Knowledge Center > Energy, Momentum and Taylor KO calculatorEnergy, Momentum and Taylor KO calculatorEnergy, Momentum and Taylor KO calculator |
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FormulaThe Taylor KO factor multiplies bullet weight (measured in grains) by muzzle velocity (measured in feet per second) by bullet diameter (measured in inches) and then divides the product by 7,000, converting the value from grains to pounds and giving a numerical value from 0 to ~150 for normal hunting cartridges. Expressed as a fraction, the Taylor KO Factor is: |
TKOF | Name | Mass | Velocity | Diameter |
---|---|---|---|---|
1.5 | .22 Long Rifle | 40 gr (2.6 g) | 1,200 ft/s (370 m/s) | .223 in (5.7 mm) |
5.6 | 5.56×45mm NATO | 62 gr (4.0 g) | 2,830 ft/s (860 m/s) | .224 in (5.7 mm) |
17.9 | 7.62x51mm NATO | 147 gr (9.5 g) | 2,733 ft/s (833 m/s) | .308 in (7.8 mm) |
28.3 | .318 Westley Richards | 250 gr (16 g) | 2,400 ft/s (730 m/s) | .330 in (8.4 mm) |
31.4 | .333 Jeffery | 300 gr (19 g) | 2,200 ft/s (670 m/s) | .333 in (8.5 mm) |
30.4 | .338 Winchester Magnum | 225 gr (14.6 g) | 2,800 ft/s (850 m/s) | .338 in (8.6 mm) |
30.2 | .350 Rigby | 225 gr (14.6 g) | 2,625 ft/s (800 m/s) | .358 in (9.1 mm) |
34.6 | .375 H&H Magnum | 235 gr (15.2 g) | 2,750 ft/s (840 m/s) | .375 in (9.5 mm) |
38.8 | .375 H&H Magnum | 300 gr (19 g) | 2,400 ft/s (730 m/s) | .375 in (9.5 mm) |
49.2 | .400 Jeffery Nitro Express | 400 gr (26 g) | 2,100 ft/s (640 m/s) | .410 in (10.4 mm) |
49.8 | .450/400 Nitro Express | 400 gr (26 g) | 2,150 ft/s (660 m/s) | .405 in (10.3 mm) |
51.4 | .404 Jeffery | 400 gr (26 g) | 2,125 ft/s (648 m/s) | .423 in (10.7 mm) |
57.1 | .416 Rigby | 400 gr (26 g) | 2,400 ft/s (730 m/s) | .416 in (10.6 mm) |
59.9 | .425 Westley Richards | 410 gr (27 g) | 2,350 ft/s (720 m/s) | .435 in (11.0 mm) |
67.5 | .450 Nitro Express | 480 gr (31 g) | 2,150 ft/s (660 m/s) | .458 in (11.6 mm) |
69.3 | .450 No 2 Nitro Express | 480 gr (31 g) | 2,175 ft/s (663 m/s) | .458 in (11.6 mm) |
74.7 | .450 Rigby | 480 gr (31 g) | 2,378 ft/s (725 m/s) | .458 in (11.6 mm) |
53 | .45-70 Government | 405 gr (50.5 g) | 2,002 ft/s (610 m/s) | .458 in (11.6 mm) |
70.3 | .458 Winchester Magnum | 500 gr (32 g) | 2,150 ft/s (660 m/s) | .458 in (11.6 mm) |
76.2 | .465 H&H Magnum | 480 gr (31 g) | 2,375 ft/s (724 m/s) | .468 in (11.9 mm) |
69 | .500/465 Nitro Express | 480 gr (31 g) | 2,150 ft/s (660 m/s) | .468 in (11.9 mm) |
72.9 | .470 Nitro Express | 500 gr (32 g) | 2,150 ft/s (660 m/s) | .475 in (12.1 mm) |
89.3 | .500 Nitro Express | 570 gr (37 g) | 2,150 ft/s (660 m/s) | .510 in (13.0 mm) |
90.9 | .505 Gibbs | 600 gr (39 g) | 2,100 ft/s (640 m/s) | .505 in (12.8 mm) |
128.3 | .577 Nitro Express | 750 gr (49 g) | 2,050 ft/s (620 m/s) | .584 in (14.8 mm) |
147.5 | .600 Nitro Express | 900 gr (58 g) | 1,850 ft/s (560 m/s) | .620 in (15.7 mm) |
200 | .700 Nitro Express | 1,000 gr (65 g) | 2,000 ft/s (610 m/s) | .700 in (17.8 mm) |
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