Difference between revisions of "20x138mmB"

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(Created page with "The '''20×138mmB''' "Solothurn Long" is a belted centerfire cartridge that was mainly used in anti-aircraft and anti-tank weapons during World War II. It was developed by the...")
 
 
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[[File:20x138mmB-Anti-Tank-Aircraft-Solothurn-Magazine-Long-Cartridge-Comparison-5.56-PMAG-Firearm-Wiki-FirearmWiki.jpg|frame|right|An image showing a '''20x138mmB''' cartridge, next to a [[5.56 NATO]] round and a 20-round Magpul PMAG - all sitting on top of a 10-round [[Solothurn S-18/1000]] magazine for size comparison. [https://imgur.com/gallery/68XUY Photo is by MOA Targets].]]
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The '''20×138mmB''' "Solothurn Long" is a belted centerfire cartridge that was mainly used in anti-aircraft and anti-tank weapons during World War II. It was developed by the Swiss [[Solothurn Firearms Company]] during the early 1930's. The designation means the bullet diameter measures at 20 mm, the length of the cartridge case is 138 mm and "B" indicates that it is a belted case. A loaded cartridge weighs in at 300 grams (10.7 oz).
 
The '''20×138mmB''' "Solothurn Long" is a belted centerfire cartridge that was mainly used in anti-aircraft and anti-tank weapons during World War II. It was developed by the Swiss [[Solothurn Firearms Company]] during the early 1930's. The designation means the bullet diameter measures at 20 mm, the length of the cartridge case is 138 mm and "B" indicates that it is a belted case. A loaded cartridge weighs in at 300 grams (10.7 oz).
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== Specifications ==
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* '''Case type:''' Bottleneck, belted
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* '''Bullet diameter:''' 20 mm (.787 in?)
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* '''Neck diameter:''' 20.9 mm (0.82 in)
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* '''Shoulder diameter:''' 25.5 mm (1.00 in)
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* '''Base diameter:''' 26.86 mm (1.057 in)
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* '''Rim diameter:''' 28.48 mm (1.121 in)
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* '''Rim thickness:''' 26.86 mm (1.057 in)
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* '''Case length:''' 138 mm (5.4 in)
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* '''Overall length:''' 202.7 mm (7.98 in)
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== Ballistic Performance ==
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{| class="wikitable"
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|-
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! Bullet Weight / Type !! Velocity !! Energy
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|-
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| 1851.88 gr. (120 grams) - Tungsten Core Armor Piercing || 2,950 ft/s (900 m/s) || 34,655 ft lbs (47,000 J)
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|}
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* '''Note:''' We tested the numbers above from the source and they don't seem to add up correctly, since they're showing 35,794 ft lbs in the energy calculator. More accurate information is needed.
  
 
== Users ==
 
== Users ==
Line 23: Line 48:
 
=== Poland ===
 
=== Poland ===
 
* Nkm wz.38 FK anti-tank vehicle-mounted gun
 
* Nkm wz.38 FK anti-tank vehicle-mounted gun
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== Help Support FirearmWiki ==
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We have a number of ways you can help to support FirearmWiki, including various affiliates. If you're already in the market for products below, it would help tremendously if you'd consider using our links to buy! They'll give us a commission at ''zero'' extra cost to you! Thanks so much for your support!
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* '''[https://amzn.to/3TtjfRF Amazon.com]''' - Our Amazon affiliate link. We'll get a small kickback for ''any'' purchase you make, at ''no'' extra cost to you!
  
 
[[Category: Centerfire Cartridges]]
 
[[Category: Centerfire Cartridges]]
 
[[Category: Anti-Tank Cartridges]]
 
[[Category: Anti-Tank Cartridges]]
 
[[Category: Anti-Aircraft Cartridges]]
 
[[Category: Anti-Aircraft Cartridges]]

Latest revision as of 11:25, 28 May 2023

An image showing a 20x138mmB cartridge, next to a 5.56 NATO round and a 20-round Magpul PMAG - all sitting on top of a 10-round Solothurn S-18/1000 magazine for size comparison. Photo is by MOA Targets.

The 20×138mmB "Solothurn Long" is a belted centerfire cartridge that was mainly used in anti-aircraft and anti-tank weapons during World War II. It was developed by the Swiss Solothurn Firearms Company during the early 1930's. The designation means the bullet diameter measures at 20 mm, the length of the cartridge case is 138 mm and "B" indicates that it is a belted case. A loaded cartridge weighs in at 300 grams (10.7 oz).

Specifications

  • Case type: Bottleneck, belted
  • Bullet diameter: 20 mm (.787 in?)
  • Neck diameter: 20.9 mm (0.82 in)
  • Shoulder diameter: 25.5 mm (1.00 in)
  • Base diameter: 26.86 mm (1.057 in)
  • Rim diameter: 28.48 mm (1.121 in)
  • Rim thickness: 26.86 mm (1.057 in)
  • Case length: 138 mm (5.4 in)
  • Overall length: 202.7 mm (7.98 in)

Ballistic Performance

Bullet Weight / Type Velocity Energy
1851.88 gr. (120 grams) - Tungsten Core Armor Piercing 2,950 ft/s (900 m/s) 34,655 ft lbs (47,000 J)
  • Note: We tested the numbers above from the source and they don't seem to add up correctly, since they're showing 35,794 ft lbs in the energy calculator. More accurate information is needed.

Users

The 20×138mmB cartridge is used in the following weapons, by the following entities:

Switzerland

  • Solothurn anti-tank rifles: S-18/1000 and S-18/1100

Germany

  • FlaK 30 and FlaK 38 single-barrel, and Flakvierling quadruple-barrel anti-aircraft guns
  • KwK 30 and KwK 38 vehicle-mounted weapons
  • MG C/30L aircraft gun

Italy

  • Cannone-Mitragliera da 20/65 modello 35 (Breda)
  • Cannone-Mitragliera da 20/77 (Scotti)

Finland

  • Lahti L-39 anti-tank rifle
  • Lahti L-40 anti-aircraft gun

Poland

  • Nkm wz.38 FK anti-tank vehicle-mounted gun

Help Support FirearmWiki

We have a number of ways you can help to support FirearmWiki, including various affiliates. If you're already in the market for products below, it would help tremendously if you'd consider using our links to buy! They'll give us a commission at zero extra cost to you! Thanks so much for your support!

  • Palmetto State Armory - A major retailer for everything gun-related. Firearms, ammo in all major calibers, and unbeatable deals on AR-15 kits & pre-builts.
  • True Shot Gun Club - An online retailer that specializes in bulk ammunition in all major calibers, including 9mm, 5.56mm, 7.62x39, 12 gauge and many more.
  • Brownells - Founded in 1939, Brownells is a one-stop shop for all things firearms, ammunition, reloading & gunsmithing supplies, and more.
  • GritrSports - A growing retailer who carries all kinds of firearms, ammunition, and various gear and accesories.
  • GunMag Warehouse - Specializing primarily in firearm magazines, ammo in all major calibers, as well as accessories & more!
  • Spartan Armor Systems - One of the leading manufacturers of various body armor, as well as steel shooting targets.
  • Black Ovis - Specializes primarily in hunting gear and various hunting supplies, including archery, camping etc.
  • Aero Precision - A major maanufacturer of AR-15's, offered in a variety of calibers.
  • Stag Arms - A manufacturer of AR-15 type firearms, available in various major calibers.
  • Airgun Depot - A major source for all things airguns & accessories, including ammo, CO2 cartridges, optics, targets & more.
  • Amazon.com - Our Amazon affiliate link. We'll get a small kickback for any purchase you make, at no extra cost to you!