4 mm caliber

This article lists firearm cartridges which have a bullet in the 4 millimetres (0.16 in) to 5 millimetres (0.20 in) caliber range.

All measurements are in mm (in).

Rimfire cartridges

Name	Bullet	Length	Rim	Base	Shoulder	Neck	OAL
.17 Mach 2	4.368 (.172)	18.14 (.714)	6.99 (.275)	5.74 (.226)	5.74 (.226)	4.57 (.180)	25.4 (1.0)
.17 HMR	4.368 (.172)	26.87 (1.058)	6.99 (.275)	5.74 (.226)	5.74 (.226)	4.57 (.180)	34.26 (1.349)
.17 PMC/Aguila	4.4 (.172)	15.0 (.591)	6.9 (.271)	-	-	-	25
.17 Winchester Super Magnum	4.4 (.172)	30.5 (1.200)	-	-	-	-	-
4.5×26mm MKR	4.5 (.177)	-	-	-	-	-	-
4mm M20 (4×10 mm)^[1]	4.89 (.1925)	7.13 (.28)	5.69 (.224)	5.03 (0.198)	-	-	9.1 (0.358)

Name	Bullet	Length	Rim	Base	Shoulder	Neck	OAL
4.25mm Liliput	4.242 (.167)	10.41 (.410)	5.029 (.198)	5.029 (.198)	N/A	5.029 (.198)	14.22 (.560)
4.38×30mm Libra	4.28 (0.169)	30.10 (1.185)	7.65 (0.301)	7.56 (0.298)	6.88 (0.271)	4.90 (0.193 )	41.00 (1.614)
4.5x40mmR^[2] for SPP-1	4.5 (0.18)	40	8.29	7.53	6.75	5.11	144.25
4.6×30mm HK	4.65 (.183)	30.50 (1.201)	8.00 (.315)	8.02 (.316)	7.75 (.305)	5.31 (0.209)	38.50 (1.516)

Name	Bullet	Length	Rim	Base	Shoulder	Neck	OAL
.17 Bumble Bee	4.368 (.172)	23.37 (.920)	10.36 (.408)	8.890 (.350)	8.636 (.340)	4.547 (.197)	-

Name	Bullet	Length	Rim	Base	Shoulder	Neck	OAL
.17 Hornet	4.368 (.172)	35.6 (1.400)	8.9 (.350)	7.6 (.299)	7.3 (.288)	4.9 (.193)	-
.17 Mach IV	4.368 (.172)	35.6 (1.40)	9.6 (.378)	9.6 (.378)	9.2 (.361)	5.2 (.206)	-
.17 Remington	4.368 (.172)	45.62 (1.796)	9.601 (.378)	9.550 (.376)	9.042 (.356)	5.055 (.199)	55.118 (2.170)
.17 Remington Fireball	4.368 (.172)	36.07 (1.420)	9.60 (.378)	9.57 (.3769)	9.33 (.3673)	5.23 (.206)	-
.17 Ackley Bee	4.4 (.172)	34 (1.35)	10.4 (.408)	8.9 (.349)	8.5 (.334)	5.0 (.195)	-
4.85×49mm	5.0 (.197)	48.9 (1.925)	9.6 (.376)	9.5 (.375)	9.0 (.353)	5.6 (.220)	62.4 (2.455)