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7.5×55mm Swiss

Introduced 1911CIP standard

Also known as GP 11, 7.5×55mm Schmidt–Rubin — the same cartridge under different names, all of which find this page.

Dimensions and pressure

Generated from the schema, like every specification table on this site, so a figure recorded on this entry cannot be missing from the table.

Identity
Designed by
not recorded
Introduced
1911
Production
not recorded
Standards body
C.I.P.
Case type
Rimless
Case shape
Bottleneck
Dimensions
Bullet diameter
7.78 mm0.3063 insource

C.I.P. G1, maximum bullet diameter.

Bore diameter
not recorded
Case length
55.6 mm2.189 insource

C.I.P. L3, maximum case length.

Overall length
77.7 mm3.059 insource

C.I.P. L6, maximum cartridge overall length.

Rim diameter
12.65 mm0.4980 insource

C.I.P. R1.

Neck diameter
8.58 mm0.3378 insource

C.I.P. H2.

Base diameter
12.64 mm0.4976 insource

C.I.P. P1.

Pressure
Maximum pressure
380 MPa55,114 psisource

C.I.P. Pmax 3800 bar; 1 bar = 0.1 MPa exactly.

Pressure standard
C.I.P.

SAAMI and C.I.P. measure pressure differently and their figures are not interchangeable, which is why the body is always named beside the figure.

Loads

No load data recorded yet. Without a sourced bullet mass and velocity there is nothing honest to compute, so the ballistic figures on pages that chamber this cartridge stay blank rather than being estimated into existence.

Chambered in

Computed from every entry that lists this cartridge. Nothing here is hand-maintained.

Gallery

Six 7.5×55mm cartridges held in two metal charger clips, with a seventh loose round standing beside them.

Image credit

Title
File:GP11.jpg
Author
Rhodium at German Wikipedia ( Original text: Rhodium )
Licence
Public domain
Source
https://commons.wikimedia.org/wiki/File:GP11.jpg
Swiss GP 11 rounds in the charger clips the Schmidt–Rubin rifles are loaded from, with one round out of the clip.

Detail

Switzerland’s service rifle cartridge from 1911 until the 1990s, and the reason Swiss surplus ammunition still has the reputation it does. The GP 11 loading was made to a standard that most armies reserved for match ammunition: a boat-tailed 11.3 g bullet, tightly controlled charges, and lot-to-lot consistency good enough that shooters bought decades-old surplus specifically to compete with it.

The cartridge was designed around the straight-pull Schmidt–Rubin action rather than the other way round. A straight-pull bolt has no primary extraction cam to break a stuck case free, so the case wants a gentle body taper and a chamber cut precisely — which the country that built it could afford to do.

No load rows appear below: the article states velocities without naming the barrel that produced them.

References

  1. C.I.P. TDCC datasheet — 7,5 x 55 Suisse · 2016-05-18 · read 2026-08-31
  2. 7.5×55mm Swiss · 1340949012 · read 2026-08-31

Last verified 2026-08-31 · review status: agent-populated