很好，这可讨论。你看过 Taylor knock out table 吗？看看他的公式。

这公式，除了子弹重及速度外，加了口径为其一参数。这也就是说，以同等材质（full metal jacket),同等弹型（不是实心比 hollow point or softpoint),口径是一决定因素。

以.45ACP 及 9mm 为例，9mm子弹速度较快，但.45acp 的knockout 指数比 9mm 多了68%。

一切条件均等是“同样弹型”，“同样材质”。在射击时，外在条件一样。当然，你可以说许多不一样的条件出来，你的条件必须是要可讨论的。

 

Taylor KO Factor is a formulaic mathematical approach for evaluating the stopping power of hunting cartridges. The term "KO" is an acronym for "Knock Out." The Taylor KO Factor (TKOF) is a derived figure that allows hunters to compare bullets with respect to stopping power. The TKOF was developed by John "Pondoro" Taylor, a famous mid-20th century hunter and poacher of African big game. The factor is computed using Equation 1.

(Equation 1)

Where

• is the bullet mass in grains (1 pound = 7000 grains)
• is the bullet velocity in feet per second
• is the bullet diameter in inches

 

Some examples of TKO factor's, and the factory loaded cartridge's derived from, are as follows:

TKO Factor	Name	Mass (gr)	Velocity (fps)	Bullet Diameter (in)
1074.9	950 JDJ	3600	2200	0.950
19.6	.308 Winchester	168	2650	0.308
147	.50 BMG	660	3050	0.510
4.72	.380 ACP	95	980	0.355
6.20	.38 Special	158	770	0.357
8.56	.357 Sig	125	1350	0.355
24.9	.300 Winchester Magnum	180	3146	0.308
13.3	7.62mm Soviet	123	2420	0.312
4.64	5.45x39mm	49	3000	0.221
35.5	.338 Lapua Magnum	250	2940	0.338
20.8	7.62×54mmR	181	2580	0.312
70.3	.458 Winchester Magnum	500	2150	0.458
42.9	.500 S&W Magnum	500	1200	0.500
36.5	.45-70	450	1250	0.458
37.7	.500 Linebaugh	440	1200	0.510
35.2	.475 Linebaugh	370	1400	0.475
29.8	.480 Ruger	325	1350	0.475
41.0	.375 H&H	300	2550	0.375
34.7	.405 Winchester	300	2000	0.4115
30.2	.454 Casull	260	1800	0.452
22.8	.38-55 Winchester	255	1650	0.3775
19.9	.44 Magnum	240	1350	0.429
12.3	.45 ACP	230	830	0.452
21.1	.35 Remington	200	2100	0.358
20.8	.30-06 Springfield	170	2850	0.308
10.4	.40 S&W	165	1080	0.400
11.3	.357 Magnum	158	1400	0.357
14.9	.30-30 Winchester	150	2250	0.308
7.31	9mm Parabellum	115	1250	0.355
8.70	.243 Winchester	85	2950	0.240
2.83	.32 ACP	71	900	0.309
5.78	.223 Remington	55	3300	0.224
1.33	.25 ACP	50	750	0.251
1.33	.22LR	30	1400	0.222