20 Gauge

Shotgun

The Goldilocks gauge — lighter than 12 but heavier than .410. Excellent for upland bird hunting and clay sports. Adequate for home defense with proper buckshot loads. Popular with female and youth shooters due to lighter shotgun weight.

Best For

Hunting Self Defense Sport Shooting Youth

Ballistics (Typical Factory Load)

1,300
Muzzle Velocity
fps
1,400
Muzzle Energy
ft-lbs
287
Typical Bullet
grains

🔧 Handloading Data

Reference load data for experienced reloaders. Always start at the start charge and work up. Consult official manuals before loading.

Bullet Powder Start Max Velocity COAL Source
0.875 gr Lead #8 Hodgdon Longshot 22.0 gr
1.43 g
25.0 gr
1.62 g
1,300 fps 2.750" Hodgdon — oz, not gr

📐 Measurement Guide for Reloaders

Powder Charge

Measured in grains (1 grain ≈ 0.065 grams) using precision digital or mechanical scales. Maintaining strict powder weight is crucial for safety and velocity consistency.

Cartridge Overall Length (COAL)

Total length from case base to bullet tip. Checked with digital calipers. Must be within manufacturer's specified range to fit and feed from your firearm's magazine.

Cartridge Base to Ogive (CBTO)

Precision shooters measure to the ogive — the curved part of the bullet that first contacts the rifling — for more accurate bullet seating depth and consistency.

Case Length & Headspace

Brass stretches with firing. Measure case length to know when to trim. Use headspace comparators to check shoulder bump-back during sizing.

Neck Tension

The grip the brass has on the bullet. Measured with ball micrometers by comparing neck wall thickness before and after bullet seating.

Pressure Signs

Inspect fired brass for over-pressure: flattened primers, ejector marks, case head expansion. If unsure, reduce charge and consult your load manual.

⚠️ Always consult established reloading manuals (Hodgdon, Hornady, Lyman) for your specific bullet and powder combinations. For experienced reloaders only.

Technical Specifications

Gauge20
TypeShotgun

Compatible Firearms (20)

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