I have been in a conversation on whether the 355 SUPER is a new caliber of simply a new name for the 9x19mm/9mm Luger.
The box label specifically warns against using in “Standard 9MM”.
The cartridge is specifically designed for use as IPSC “Major” with a power factor of 165 (bullet weight x muzzle velocity) or greater. A “Minor” must have a power factor of 125 or greater. Research indicates that a normal 9mm Para/Luger load qualifies as a minor but not a major.
A bit of research on the net yielded the following info (the first five are from Wikipedia and the last is from ingunowners.com/forums/accessori … 9mm_p.html).
• CIP Spec requires the 9x19mm case handle 235 MPa (34,083 psi)
• SAAMI requires 241.32 MPa (35,000 psi) for a standard load
• SAAMI requires 265.45 MPa (38,500 psi) for the +P load
• 9 mm NATO is rated at 252 MPa (36,550 psi)
• Proof, both CIP and NATO are rated 315.0 MPa (45,687 psi)
• +P+ loads in 9x19 have been proposed at 42,000psi with proof pressure at 49,800 psi
By my calculations, a 125gr bullet can have a muzzle velocity of 1000ft/sec and qualify as “minor” but must have a muzzle velocity of 1320 ft/sec to qualify as “major”. The nominal velocity of a “standard” 9x19mm with a 124gr bullet is about 1120-1150 ft/sec according to information on commercial loads from the internet-see the end of this posting.
The nominal velocity with a 124gr bullet
• Standard 9x19mm: 1120-1150 ft/sec.
• +P: 1180-1220 ft/sec
• +P+: 1170 to 1240 ft/sec
Comparing the Max Pressure and Max Velocity from this limited data
The nominal velocity with a 124gr bullet> of a “with a
• Standard” 9x19mm: 1150 ft/sec and 35,000 psi
• +P: 1220 ft/sec and 38,500 psi
• +P+: 1240 ft/sec and 42,000 psi
and just eye balling the numbersimplies to me that to achieve a muzzle velocity consistently above 1320ft/sec with a 125gr bullet would require a pressure approaching 50,000 psi! That is well above normal 9mm proof pressure of about 45,700psi and about the same as the accepted +P+ proof pressure of 49,800 psi.
It appears to me that the .355 Super would be a dangerous load to shoot regularly through most 9x19mm pistols. This is probably why it has a name and a headstamp that has nothing to do with 9mm.
This is just back of the envelop but it sure appears that the 355 Super would require a different class of pistols from the standard 9x19mm.
Does anyone have additional information on the 355 Super???
How about insights into my speculation above???
Do you think the 355 Super is really a new caliber???
Is it different enough from the 9mm Luger to be a different caliber (like the 9mm Glisenti)???
I have found the following information on commercial loads:
• Federal Hydra-Shok 124gr +P+ (P9HS3G1)Muzzle velocity is rated at 1170 ft/sec (4" Barrel) [frag.110mb.com/]
• Federal Hydra-Shok 124gr (P9HS1) Muzzle velocity is rated at 1120 FPS (4" Barrel) [same ref]
• Federal HST 124gr JHP (P9HST1) Muzzle velocity is rated at 1150 FPS (4" Barrel) [same ref]
• Remington Golden Saber BONDED 124gr +P BJHP (GSB9MMD) Muzzle velocity is rated at 1180 FPS [same ref]
• SPEER Gold Dot® 124gr GDHP (23618) Muzzle velocity is rated at 1150 FPS [same ref]
• SPEER Gold Dot® 124gr GDHP +P (53617) Muzzle velocity is rated at 1220 FPS (4" Barrel) [same ref]
• Winchester Ranger T 127gr +P+ JHP (RA9TA) Muzzle velocity is rated at 1240 FPS (4" Barrel) [same ref]
• 124gr +p ProLoad Tactical Gold Dot at 1,200fps [greent.com/40Page/general/defammo.htm]
• 124gr +p Remington Golden Saber at 1,180fps [same ref]