Here is a consolidate summary of all the rimfire 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 rimfire cartridges. CUP values are no longer part of the SAAMI Manuel.
- The trim to length is equivalent to the minimum case length.
- While most rimfire cartridges will not be reloaded, must less be trimmed the trim to length is provided for reference and is the min case length.
- 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
17 Mach 2
SAAMI MAP (PSI) – 24,000
Headspace – Rim
Headspace Dim – .043 to .051
Max Case Length – .714
Trim to Length – .706
COAL – 1.000 to .965
Head Diameter – .278
17 Hornady Magnum Rimfire
SAAMI MAP (PSI) – 26,000
Headspace – Rim
Headspace Dim – .050 to .056
Max Case Length – 1.064
Trim to Length – 1.056
COAL – 1.365 to 1.330
Head Diameter – .294
17 Winchester Super Magnum
SAAMI MAP (PSI) – 33,000
Headspace – Rim
Headspace Dim -.066 to .071
Max Case Length – 1.200
Trim to Length – 1.192
COAL – 1.440 to 1.590
Head Diameter – .333
22 Short
SAAMI MAP (PSI) – 21,000
Headspace – Rim
Headspace Dim – .043 to .051
Max Case Length – .421
Trim to Length – .414
COAL – .695 to .660
Head Diameter – .278
22 Long
SAAMI MAP (PSI) – 24,000
Headspace – Rim
Headspace Dim – .043 to .051
Max Case Length – .613
Trim to Length – .605
COAL – .888 to .853
Head Diameter – .278
22 Winchester Rimfire
SAAMI MAP (PSI) – 20,000
Headspace – Rim
Headspace Dim – .050 to .056
Max Case Length – .965
Trim to Length – .945
COAL – 1.180 to 1.155
Head Diameter – .300
22 Winchester Rimfire Magnum
SAAMI MAP (PSI) – 24,000
Headspace – Rim
Headspace Dim – .050 to .056
Max Case Length – 1.055
Trim to Length – 1.047
COAL – 1.350 to 1.320
Head Diameter – .294