Here is a consolidate summary of all the pistol calibers that are currently recognized by SAAMI. The purpose of this is to provide a quick glance of cartridge specs for the curious mind.
- The SAAMI Maximum Average Pressure (MAP) is listed in both the Copper Units of Pressure (CUP) and the Pounds per Square Inch (PSI).
- Some cartridges do not have either a PSI or CUP listed, and they are omitted.
- Cartridges with +P Pressures, list both the standard and +P Pressure.
- The trim to length is equivalent to the minimum case length. While most pistol cartridges will not require trimming, it is listed for reference.
- COAL stands for Cartridge Overall Length, and is the measurement from case head to bullet tip.
- The source of this information is the SAAMI Manuel
- Last revised 1-16-2021
9mm Luger
MAP (CUP) – 33,000
MAP (PSI) – 35,000
MAP +P (PSI) – 38,500
Headspace – Case Mouth
Headspace Dim – .776 to .754
Max Case Length – .754
Trim to Length – .744
COAL – 1.000 to 1.169
Head Diameter – .394 (-.010)
Small Pistol Primer
9×18 Makarov
MAP (PSI) – 24,100
Headspace – Case Mouth
Headspace Dim – .725 to .713
Max Case Length – .713
Trim to Length – .703
COAL – .964 to .984
Head Diameter – .3976
Small Pistol Primer
9×23 Winchester
MAP (PSI) – 55,000
Headspace – Case Mouth
Headspace Dim- .922 to .900
Max Case Length – .900
Trim to Length – .890
COAL – 1.300 to 1.150
Head Diameter – . 3950
Small Pistol Magnum Primer
10mm Automatic
MAP (PSI) – 37,500
Headspace – Case Mouth
Headspace Dim- 1.004 to .992
Max Case Length – .992
Trim to Length – .982
COAL – 1.260 to 1.240
Head Diameter – .425
Large Pistol Primer
221 Remington Fireball
MAP (CUP) – 52,000
MAP (PSI) – 60,000
Headspace – Shoulder .330
Headspace Dim – 1.1138 to 1.1038
Max Case Length – 1.400
Trim to Length – 1.380
COAL – 1.830 to 1.780
Head Diameter – .378
Small Rifle Primer
25 Automatic
MAP (CUP) – 18,000
MAP (PSI) – 25,000
Headspace – Rim
Headspace Dim – .043 to .053
Max Case Length – .615
Tim to Length – .595
COAL – .910 to .860
Head Diameter – .302
Small Pistol Primer
25 North American Arms
MAP (PSI) – 23,900
Headspace – Shoulder .300
Headspace Dim – .5692 to .5792
Max Case Length – .745
Trim to Length – .725
COAL – .960 to .900
Head Diameter – 337
Small Pistol Primer
30 Luger (7.65mm)
MAP (CUP) – 28,000
MAP (PSI) – 28,000
Headspace – Shoulder .355
Headspace Dim -.6618 to .6718
Max Case Length – .850
Trim To Length – .830
COAL – 1.175 to 1.125
Head Diameter – .394
Small Pistol Primer
32 Automatic
MAP (CUP) – 15,000
MAP (PSI) – 20,500
Headspace – Rim
Headspace Dim – .045 to .055
Max Case Length – .680
Trim to Length – .660
COAL – .984 to .890
Head Diameter – .358
Small Pistol Primer
32 H&R Magnum
MAP (CUP) – 21,000
MAP (PSI) – N/E
Headspace – Rim
Headspace Dim – .056 to .070
Max Case Length – 1.075
Trim to Length – 1.055
COAL – 1.350 to 1.300
Head Diameter – .375
Small Pistol Primer
32 North American Arms
MAP (PSI) – 23,900
Headspace – Shoulder .355
Headspace Dim – .5411 to .5511
Max Case Length – .680
Trim To Length – .670
COAL – .984 to .940
Head Diameter – .374
Small Pistol Primer
32 Short Colt
MAP(CUP) – 13,000
MAP (PSI) – 17,500
Headspace – Rim
Headspace Dim – .053 to .067
Max Case Length – .650
Trim to Length – .630
COAL – 1.015 to .965
Head Diameter – .375
Small Pistol Primer
32 Smith & Wesson
MAP (CUP) – 12,000
MAP (PSI) – 17,000
Headspace – Rim
Headspace Dim – .055 to .069
Max Case Length – .603
Trim to Length – .585
COAL – .930 to .880
Head Diameter – .378
Small Pistol Primer
32 Smith & Wesson Long
MAP (CUP) – 12,000
MAP (PSI) – 15,000
Headspace – Rim
Headspace Dim – .056 to .070
Max Case Length – .920
Trim to Length – .900
COAL – 1.230 to 1.210
Head Diameter – .375
Small Pistol Primer
327 Federal Magnum
MAP (PSI) – 45,000
Headspace – Rim
Headspace Dim – .056 to .070
Max Case Length – 1.200
Trim To Length – 1.180
COAL – 1.475 to 1.275
Head Diameter – .375
Small Pistol Magnum Primer
356 TSW
MAP (PSI) – 50,000
Headspace – Case Mouth
Headspace Dim – .850 to .860
Max Case Length – .850
Trim to Length – .840
COAL – 1.160 to 1.100
Head Diameter – .394
Small Pistol Magnum Primer
357 Magnum
MAP (CUP) – 45,000
MAP (PSI) – 35,000
Headspace – Rim
Headspace Dim – .060 to .070
Max Case Length – 1.290
Trim to Length – 1.270
COAL – 1.590 to 1.405
Head Diameter – .440
Small Pistol Primer
357 Sig
MAP (PSI) – 40,000
Headspace – Case Mouth
Headspace Dim – .865 to .877
Max Case Length – .865
Trim to Length – .855
COAL – 1.140 to 1.100
Head Diameter – .424
Small Pistol Primer
38 Smith & Wesson
MAP (CUP) – 13,000
MAP (PSI) – 14,500
Headspace – Rim
Headspace Dim – .056 to .070
Max Case Length – .775
Trim To Length – .755
COAL – 1.240 to 1.150
Head Diameter – .444
Small Pistol Primer
38 Special
MAP (CUP) – 17,000
MAP +P (CUP) – 20,000
MAP (PSI) – 17,000
MAP +P (PSI) – 20,000
Headspace – Rim
Headspace Dim – .060 to .074
Max Case Length – 1.155
Trim to Length 1.135
COAL – 1.550 to 1.275
Head Diameter – .440
Small Pistol Primer
38 Automatic
MAP (CUP) – 23,000
MAP (PSI) – 26,500
Headspace – Rim
Headspace Dim – .050 to .070
Max Case Length – .900
Trim to Length – .890
COAL – 1.280 to 1.220
Head Diameter .406
Small Pistol Primer
38 Super Automatic
MAP (CUP) – 33,000
MAP (PSI) – 36,500
Headspace – Rim
Headspace Dim – .050 to .070
Max Case Length – .900
Trim to Length – .890
COAL – 1.280 to 1.220
Head Diameter .406
Small Pistol Primer
380 Automatic
MAP (CUP) – 17,000
MAP (PSI) – 21,500
Headspace – Case Mouth
Headspace Dim – .703 to .681
Max Case Length – .680
Trim To Length – .670
COAL – .984 to .910
Head Diameter – .374
Small Pistol Primer
40 Smith & Wesson
MAP (PSI) – 35,000
Headspace – Case Mouth
Headspace Dim – .850 to .862
Max Case Length – .850
Trim to Length – .840
COAL – 1.135 to 1.085
Head Diameter – .424
Small Pistol Primer
400 Cor-Bon
MAP (PSI) – 35,000
Headspace – Shoulder .4463
Headspace Dim – .735 to .725
Max Case Length – .900
Trim to Length – .890
COAL – 1.225 to 1.175
Head Diameter – .480
Large or Small Pistol Primer
41 Remington Magnum
MAP (CUP) – 40,000
MAP (PSI) – 36,000
Headspace – Rim
Headspace Dim – .060 to .070
Max Case Length – 1.290
Trim to Length – 1.270
COAL – 1.590 to 1.540
Head Diameter – .492
Large Pistol Primer
44 Remington Magnum
MAP (CUP) – 40,000
MAP (PSI) – 36,000
Headspace – Rim
Headspace Dim – .060 to .070
Max Case Length – 1.285
Trim to Length – 1.265
COAL – 1.610 to 1.535
Head Diameter – .514
Large Pistol Primer
44 S&W Special
MAP (CUP) – 14,000
MAP (PSI) – 15,500
Headspace – Rim
Headspace Dim – .060 to .074
Max Case Length – 1.160
Trim to Length – 1.140
COAL – 1.615 to 1.415
Head Diameter – .514
Large Pistol Primer
45 Automatic
MAP (CUP) – 18,000
MAP (PSI) – 21,000
MAP +P (PSI) – 23,000
Headspace – Case Mouth
Headspace Dim – .898 to .920
Max Case Length – .898
Trim to Length – .888
COAL – 1.275 to 1.190
Head Diameter – .480
Large or Small Pistol Primer
45 Auto Rim
MAP (CUP) – 15,000
MAP (PSI) – N/E
Headspace – Rim
Headspace Dim – .090 to .104
Max Case Length – .898
Trim to Length – .878
COAL – 1.275 to 1.225
Head Diameter – .516
Large Pistol Primer
45 Colt
MAP (CUP) – 14,000
MAP (PSI) – 14,000
Headspace – Rim
Headspace Dim – .060 to .074
Max Case Length – 1.285
Trim to Length – 1.265
COAL – 1.600 to 1.515
Head Diameter – .512
Large Pistol Primer
45 Glock Automatic Pistol
MAP (PSI) – 23,000
Headspace – Case Mouth
Headspace Dim – .760 to .772
Max Case Length – .760
Trim to Length – .750
COAL – 1.137 MAX
Head Diameter – .470
Small Pistol Primer
45 Winchester Magnum
MAP (CUP) – 40,000
MAP (PSI) – 41,500
Headspace – Case Mouth
Headspace Dim – 1.210 to 1.198
Max Case Length – 1.198
Trim to Length – 1.188
COAL – 1.575 to 1.545
Head Diameter – .480
Large Pistol Primer
454 Casull
MAP (PSI) – 65,000
Headspace – Rim
Headspace Dim – .058 to .072
Max Case Length – 1.383
Trim to Length – 1.363
COAL – 1.765 to 1.665
Head Diameter – .512
Small Pistol Primers
460 S&W Magnum
MAP (PSI) – 65,000
Headspace – Rim
Headspace Dim – .060 to .069
Max Case Length – 1.800
Trim to Length – 1.900
COAL – 2.290 to 1.900
Head Diameter – .524
Large Rifle Primer
475 Linebaugh
MAP (PSI) – 50,000
Headspace – Rim
Headspace Dim – .071 to .085
Max Case Length – 1.400
Trim to Length – 1.380
COAL – 1.765 to 1.665
Head Diameter – .542
Large Pistol
480 Ruger
MAP (PSI) – 48,000
Headspace – Rim
Headspace Dim – .071 to .081
Max Case Length – 1.285
Trim to Length – 1.270
COAL – 1.650 to 1.550
Head Diameter – .542
Large Pistol Primer
50 Action Express
MAP (PSI) – 35,000
Headspace – Case Mouth
Headspace Dim – 1.285 to 1.297
Max Case Length – 1.285
Trim to Length – 1.275
COAL – 1.595 to 1.555
Head Diameter – .515
Large Pistol
500 S&W Magnum
MAP (PSI) – 60,000
Headspace – Rim
Headspace Dim – .069 to .059
Max Case Length – 1.625
Trim to Length – 1.615
COAL – 2.250 to 1.900
Head Diameter – .560
Larger Rifle Primer
500 Special
MAP (PSI) – 36,000
Headspace – Rim
Headspace Dim – .059 to .069
Max Case Length – 1.285
Trim to Length – 1.275
COAL – 1.765 to 1.415
Head Diameter – .560
Larger Rifle Primer