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BL 12 inch Mk I – VII gun
Photo: Hudson & Kearns. · Wikimedia Commons · Public domain
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BL12inchMkI–VIIgun

Naval Guns · United Kingdom · 1882
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BL12inchMkI–VIIgun

BL 12 inch Mk I – VII gun
BL 12 inch Mk I – VII gun Photo: Hudson & Kearns. · Wikimedia Commons · Public domain
* Absolute score — assessed within category · no era adjustment
Rate of Fire
30
Range
40
Lethality
50
Accuracy
45
Ammunition Versatility
20
Multi-Role Capability
10
Reliability
70
Automation
5
Technology
25
Cost-Effectiveness
60
Origin United Kingdom
CategoryNaval Guns
EraPre-WWI / Industrial Age
In service1882–1920
Operators1 countries
Quantity11
Data Quality84%
MASS(Military Archive Scoring System)
36
Naval Guns MASS Rating
65/131
Pre-WWI / Industrial Age
191/280
All-Time
Naval Guns · 10 axes scored
Rate of Fire
30
Range
40
Lethality
50
Accuracy
45
Ammunition Versatility
20
Multi-Role Capability
10
Reliability
70
Automation
5
Technology
25
Cost-Effectiveness
60
ⓘ Regardless of era, the same scoring system applies to all units in the naval guns category.
01 / Overview
BL 12 inch Mk I – VII gun
Category
Production
1882–1920
Quantity
11
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
NAVAL GUNS · PRE-WWI / INDUSTRIAL AGE
65
PERFORMANCE/PRICE
78
UNIT COST (2025 USD)
—
36
naval guns category
ⓘ Performance/Price and MASS score are computed across all units in the naval guns category, regardless of era.
02 / Specs & Design
◎General6MOD.6
  • Weapon Typerifled breech-loading naval gun
  • Service Entry Year1882
  • Weight43,000 kg
  • Length8.38 m
  • Diameter304.8 mm
  • In ServiceNo
◈Guidance & Homing4MOD.4
▣Performance2MOD.2
  • Range7.315 km
  • Maximum Range (gun)16 km
◇Warhead1MOD.1
◆Platform4MOD.4
▤Production2MOD.2
  • Total Production3
  • Operators1
03 / History
SERVICE LIFESPANRetired
  1. 1882Production started
  2. 1920Production ended
144
years in service
38
years in production
11
units produced
0
countries operating
ⓘ 1 countries retired it.
04 / Operators
Operator Countries1country
📖 TERMS ON THIS PAGE2terms
Surface ship from which a torpedo is launched, typically a destroyer, cruiser, or dedicated torpedo boat.
Ship-launched: a torpedo designed to be deployed from surface warships using onboard launch tubes or deck-mounted launchers.
These terms are listed automatically because they appear on this page.full encyclopedia →
📚 Sources
📖 ENCYCLOPEDIA Browse the Naval Guns entry →