Take in note that all the results below have been done from five meters range tests.
The image here shows you some bullet proofs resistances to different types of bullets

 

 

[1] .22 Magnum 40 gr. JHP (1209 FPS / 369 MPS)
[2] .32 ACP 60 gr. Silvertip JHP (936 FPS / 285 MPS)
[3] .380 ACP 95 gr. FMC (902 FPS / 275 MPS)
[4] .38 Special 125 gr. Nyclad SWHP (1009 FPS / 308 MPS)
[5] .38 Special +P 110 gr. JHP (1049 FPS / 320 MPS)
[6] .38 Special +P 140 gr. JHP (869 FPS / 265 MPS)
[7] 9mm 124 gr. FMC (1173 FPS / 358 MPS)*
[8] 9mm 125 gr. JSP (1121 FPS / 342 MPS)
[9] 9mm 147 gr. Black Talon (1010 FPS / 308 MPS)
[10] 9mm 147 gr. Golden Saber (1083 FPS / 330 MPS)
[11] 9mm 147 gr. Hydra Shok (1011 FPS / 308 MPS)
[12] .357 Magnum 158 gr. JSP (1308 FPS / 399 MPS)*
[13] .357 Magnum 110 gr. JHP (1292 FPS / 394 MPS)
[14] .357 Magnum 125 gr. JHP (1335 FPS / 407 MPS)
[15] .40 Caliber 180 gr. FMJTC (992 FPS / 302 MPS)
[16] .40 Caliber 170 gr. FMJTC (1095 FPS / 334 MPS)
[17] 10mm 155 gr. FMJTC (1024 FPS / 312 MPS)
[18] 10mm 170 gr. JHP (1137 FPS / 347 MPS)
[19] .41 Magnum 210 gr. LSWC (1141 FPS / 348 MPS)
[20] .44 Magnum 240 gr. LFP (1017 FPS / 310 MPS)
[21] .45 Long Colt 250 gr. LRN (778 FPS / 237 MPS)
[22] .45 ACP 230 gr. FMJ (826 FPS / 252 MPS)
[23] 12 ga. 00 Buck (9 pellet) (1063 FPS / 324 MPS)
[24] 9mm 124 gr. FMJ (1215 FPS / 370 MPS)*
[25] 9mm 115 gr. Silvertip JHP (1252 FPS / 382 MPS)
[26] 9mm 124 gr. Starfire JHP (1174 FPS / 358 MPS)
[27] .357 Magnum 158 gr. JSP (1453 FPS / 443 MPS)*
[28] .357 Magnum 145 gr. Silvertip JHP (1371 FPS / 418 MPS)
[29] .357 Magnum 125 gr. JHP (1428 FPS / 435 MPS)
[30] 10 mm 175 gr. Silvertip JHP (1246 FPS / 380 MPS)
[31] .41 Magnum 210 gr. JSP (1322 FPS / 403 MPS)
[32] .44 Magnum 240 gr. SJHP (1270 FPS / 387 MPS)
[33] 9mm 124 gr. FMJ (1440 FPS / 439 MPS)*
[34] 9mm 115 gr. FMJ Israeli (1499 FPS / 457 MPS)
[35] 9mm 123 gr. FMJ Geco (1372 FPS / 418 MPS)
[36] 9mm 124 gr. FMJ Cavim (1259 FPS / 384 MPS)
[37] .44 Magnum 240 gr. LSWC (1448 FPS / 441 MPS)*
[38] .44 Magnum 240 gr. HSP (1320 FPS / 402 MPS)
[39] 12 ga. 1 oz. Rifled Slug (1290 FPS / 393 MPS)
[40] 12 ga. 1 oz. Rifle Slug (1254 FPS / 382 MPS)

* NIJ certification round when used in concert with the NFCAS sternum plate.

Abbreviations:

FMC (or FMJ): Full Metal Case (or Full metal Jacket)
FMJTC: Full Metal Jacket Truncated Cone
HSP: Hollow Soft Point
LRB: Lead Round Ball
LRN: Lead Round Nose
LSWC: Lead Semi-Wadcutter
JHP: Jacketed Hollow Point
JSP: Jacketed Soft Point
LFP: Lead Flat Point
SJHP: Semi-Jacketed Hollow Point
SWHP: Semi-Wadcutter Hollow Point

Bullet Proofs Levels:

Level I ~ Not recommended for protection against a firing threat. This level may stop a .22 caliber round and a .38 ACP round but that’s likely the best protection that level could ever offer. It’s often fabricated based off fibers from older generation and it offers a pretty low protection despite its size. It’s mostly ideal for Air Soft and Paintball games only.
*A personal test revealed that it could also give a fairly great protection against sharp knife slashes. However, knife stabbings would be very damaging.

- Level II A ~ 16 layers of Kevlar ® 129 that is very close to the KG1A’s specifics. It is the minimum requirement for protection against firing threats. It’s good against 9mm rounds, .40 S&W rounds and other equivalents. In basic terms for bullet proof vests, this is what people would consider a “light bullet proof vest”.

- Level II ~ 22 layers of Kevlar ® 129 which is the most popular protection for police officers around the globe. In basic terms for bullet proof vests, this is what people would consider a “medium bullet proof vest”.

- Level III A + ~ 30 layers of Kevlar ® 129 which is mainly reserved for higher risks from firing threats. Although it might be heavy, it is a whole lot more resistant as well. It can cleanly stop a .44 Magnum round. In basic terms for bullet proof vests, this is what people would consider a “medium-heavy bullet proof vest”.

- Level III + ~ 45 layers of Kevlar ® 129 which is the highest number of Kevlar ® you could ever get without adding plates. It is most commonly used by special forces elites and it can pretty much stop a 7.62mm round. In basic terms for bullet proof vests, this is what people would consider a “heavy bullet proof vest”. You may expect having way less agility while wearing such vest, as it is slightly more than twice of what most police officers around the globe wear.

- Level IV ~ This is where it is no longer a concealable vest, but plates. The plates are either made of ceramic or steel. It can stop high powered automatic firearms and it was mainly designed for a .30 caliber with energy impact of 3057 feet / pound. Heaviest protection you could ever get on your body.