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8mm Breda vs. 8mm Mauser
8x59mm Breda, Italian
Machine Gun Cartridge
The 8x59mm Breda cartridge was introduced in 1935
for the 1937 Italian Breda Model 38 machine-gun.
The 8mm Breda replaced the 6.5x52mm Mannlicher-
Carcano as a more effective machine gun cartridge.
It is easy to mistake this cartridge for the popular
8mm German Mauser, as it is only app. 1/10" longer,
and has a  .023" thicker base diameter at the top
of the extractor groove.  Also, note the bottleneck is
app. .097" higher than the 8mm Mauser.
The 8mm Breda has a slightly rebated rim.
On my micrometer, the projectile diameter on the 8mm
Breda was 8.28mm vs 8.08mm on a 8mm Mauser.
Please see different variations below:
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8mm
Mauser
8mm
Breda
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.SMI 941 Head Stamp, 1941, Dark, almost
black,
lacquered steel case, with copper clad steel
projectile. 3 Crimp  Primer. SMI: denotes
Societa Metallurgica Italiana Military Arsenal
SMI 940 Head Stamp, 1940 Brass case,
with copper clad steel projectile. SMI:
denotes
Societa Metallurgica Italiana Military
Arsenal
$ 3.75 per
Cartridge
$ 3.75 per
Cartridge
"BPD 37" Head Stamp, First Year! 1937
with a H/S. Brass case, with nickel clad steel
projectile.
BPD: denotes Bombrimi Parodi-Delfino
Colleferro Italy Military Arsenal ?  
LIMIT ONE
.SMI 944 Head Stamp, 1944, light brown
lacquered Steel case, with copper clad steel
projectile. 3 crimped primer.  SMI: denotes
Societa Metallurgica Italiana Military
Arsenal
$ 4.75 per
Cartridge
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$ 3.75 per
Cartridge
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$3.75  per
Cartridge
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$4.75  per
Cartridge
SMI 941 Head Stamp, 1941 Brass case,
with copper clad steel projectile. SMI:
denotes
Societa Metallurgica Italiana Military
Arsenal
Only a Few, Limit One.
SMI 938 Head Stamp, 1938 Brass case,
with copper clad steel projectile. SMI:
denotes
Societa Metallurgica Italiana Military
Arsenal
Only a Few, Limit One.
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This Hotchkiss feed stripe was used
to feed 20 rounds or more
into the machine gun.
They are of complicated
construction and the empty cases
were put back into the tray by the
gun feed mechanism.
So the tray was ejected from the
gun complete with its 20 cases -
very tidy battlefield, and cleanup.
More information on
this gun and cartridge
at the bottom of this
page.
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It is very interesting to note that the 8mm Breda Machine Gun Cartridge
isn't an 8mm at all, but a 8.28 mm, which is more then the .325" caliber
(.325" projectile is 8.21mm) this maybe why no other firearm has ever been
chambered in this caliber for production made firearms.