French
75 mm/50 (2.95") Model 1922, 1924 and 1927
Updated 24 March 2007
An SP Weapon adapted for the AA role, it was obsolete by the start of World War II.  Fired fixed rounds.

I have been unable to determine the differences between the Model years, but I suspect that they had to do with the mountings.
WNFR_3-50_m1922_Bearn_pic.jpg

Experimental Carrier Béarn in 1937
The 75 mm (2.95") guns are in the mountings just in front of the island and below the flight deck
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Gun Characteristics
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Designation 75 mm/50 (2.95") Model 1922, 1924 and 1927
Ship Class Used On Bretagne, Béarn, Duquesne, Suffren, Jeanne D'Arc and Duguay-Trouin classes
Date Of Design 1922, 1924 and 1927
Date In Service 1926
Gun Weight 1.05 tons (1.07 mt)
Gun Length oa N/A
Bore Length 147.6 in (3.75 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 8 - 15 rounds / minute
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Ammunition
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Type Fixed
Weight of Complete Round 26.5 lbs. (12 kg)
Projectile Types and Weights HE - 13.07 lbs. (5.93 kg)
Bursting Charge N/A
Projectile Length N/A - Complete round 38.1 in (96.67 cm)
Propellant Charge 4.81 lbs. (2.18 kg) BM5
Cartridge - 13.4 lbs. (6.08 kg)
Muzzle Velocity 2,789 fps (850 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun
(see Note)		 Duguay-Trouin:  125 rounds
Others:  N/A
Note:  Duguay-Trouin outfit for four guns was 540 rounds HE, 120 rounds illumination and 90 practice rounds.
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Range
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Elevation 13.07 lbs. (5.93 kg) HE Shell
Range @ 40 degrees 15,420 yards (14,100 m)
AA Ceiling @ 90 degrees about 26,250 feet (8,000 m)
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Mount / Turret Data
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Designation Single open emplacements
   Bretagne (8), Bearn (6), Duquesne (8), Suffren (8), Jeanne D-Arc (4) and Duguay-Trouin (4)
Weight  N/A
Elevation -10 / +90 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil N/A
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Data from
"Naval Weapons of World War Two" by John Campbell
"Navies of the Second World War - The French Navy" by Henri le Masson
"French Light Cruisers" article by Jean Guigliani and Albert Moreau in "Warships International No. 3, 2001"
"Battleships of World War Two" and "Cruisers of World War Two" both by M.J. Whitley