Here is a consolidate summary of all the Shotshell cartridges that are currently recognized by SAAMI. The purpose of this is to provide a quick glance of cartridge specs for the curious mind.
- SAAMI only lists transducer pressures for Shotshell cartridges. CUP values are no longer part of the SAAMI Manuel.
- Shell Cartridge Overall Length (COAL) Folded is the cartridge length measured from case head to the top of the radius.
- Shell Cartridge Overall Length (COAL) Rolled is the cartridge length measured from case head to the top of the radius.
- Uncrimped Length is the length of the cartridge when the cartridge has been fired, or prior to crimping.
- SAAMI Does not specify primer size, however shot shells typically all take 209 type primers, however some all brass shells may take large pistol primers.
- The source of this information is the SAAMI Manuel
- Last revised 1-16-2021
10 Gauge 3 1/2″
MAP (PSI) – 11,000
Headspace – Rim @ .8900
Headspace Dim – .0624 to .0764
Shell COAL Folded – 3.110
Shell COAL Rolled – 3.290
Uncrimped Length – 3.510
Head Diameter – .933
Primer Size 209
12 Gauge 1 3/4“
MAP (PSI) – 11,500
Headspace – Rim @ .8500
Headspace Dim – .0576 to .0716
Shell COAL Folded – 1.550
Shell COAL Rolled – 1.600
Uncrimped Length – 1.760 to 1.660
Head Diameter – .886
Primer Size 209
12 Gauge 2 3/4″
MAP (PSI) – 11,500
Headspace – Rim @ .8500
Headspace Dim – .0576 to .0716
Shell COAL Folded – 2.405
Shell COAL Rolled – 2.450
Uncrimped Length – 2.760 to 2.660
Head Diameter – .886
Primer Size 209
12 Gauge 3″
MAP (PSI) – 11,500
Headspace – Rim @ .8500
Headspace Dim – .0576 to .0716
Shell COAL Folded – 2.655
Shell COAL Rolled – 2.760
Uncrimped Length – 3.010 to 2.910
Head Diameter – .886
Primer Size 209
12 Gauge 3 1/2″
MAP (PSI) – 14,000
Headspace – Rim @ .8500
Headspace Dim – .0576 to .0716
Shell COAL Folded – 3.155
Shell COAL Rolled – 3.155
Uncrimped Length – 3.510 to 3.260
Head Diameter – .886
Primer Size 209
16 Gauge 2 3/4″
MAP (PSI) – 11,500
Headspace – Rim @ .7850
Headspace Dim – .0506 to .0646
Shell COAL Folded – 2.440
Shell COAL Rolled – 2.475
Uncrimped Length – 2.760 to 2.660
Head Diameter – .819
Primer Size 209
20 Gauge 2 3/4″
MAP (PSI) – 12,000
Headspace – Rim @ .7300
Headspace Dim – .0484 to .0624
Shell COAL Folded – 2.445
Shell COAL Rolled – 2.550
Uncrimped Length – 2.760 to 2.660
Head Diameter – .766
Primer Size 209
20 Gauge 3″
MAP (PSI) – 12,000
Headspace – Rim @ .7300
Headspace Dim – .0506 to .0646
Shell COAL Folded – 2.695
Shell COAL Rolled – 2.800
Uncrimped Length – 3.010 to 2.910
Head Diameter – .766
Primer Size 209
28 Gauge 2 3/4″
MAP (PSI) – 12,500
Headspace – Rim @ .6550
Headspace Dim – .0498 to .0638
Shell COAL Folded – 2.500
Shell COAL Rolled – 2.560
Uncrimped Length – 2.760 to 2.660
Head Diameter – .687
Primer Size 209
410 Bore 2 3/4″
MAP (PSI) – 12,500
Headspace – Rim @ .5050
Headspace Dim – .0532 to .0672
Shell COAL Folded – 2.360
Shell COAL Rolled – 2.400
Uncrimped Length – 2.530 to 2.430
Head Diameter – .535
Primer Size 209
410 Bore 3″
MAP (PSI) – 13,500
Headspace – Rim @ .5050
Headspace Dim – .0532 to .0672
Shell COAL Folded – 2.840
Shell COAL Rolled – 2.900
Uncrimped Length – 3.010 to 2.910
Head Diameter – .535
Primer Size 209