Reliable .220 Swift reloading data can be found in official manufacturer manuals and online databases published by industry leaders such as Hodgdon, Hornady, Nosler, Sierra, and Lyman. Published data typically covers bullet weights from 40 grains up to 60 grains, detailing starting and maximum powder charges, muzzle velocities, chamber pressures up to SAAMI maximum limits around 52,000 to 54,000 CUP, cartridge overall length, and test barrel specifications. Because the .220 Swift is an ultra high velocity cartridge operating at high working pressures, minor component variations in brass capacity, large rifle primer selection, seating depth, and barrel throat wear can significantly alter pressure and velocity outcomes.
220 Swift Reloading Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity | Barrel Length / Firearm | Source |
| Hornady SP | 40 gr | Hodgdon H-414 | 39.2 gr | 42.1 gr | 3,923 to 4,213 fps | 24″ / Test Barrel | Hodgdon |
| Hornady SP | 45 gr | Hodgdon Varget | 37.7 gr | 40.0 gr | 3,777 to 4,002 fps | 24″ / Test Barrel | Hodgdon |
| Hornady SP | 50 gr | Hodgdon H-380 | 36.6 gr | 39.4 gr | 3,668 to 3,947 fps | 24″ / Test Barrel | Hodgdon |
| Sierra HPBT | 52 gr | Hodgdon H-4895 | 35.8 gr | 37.3 gr | 3,588 to 3,736 fps | 24″ / Test Barrel | Hodgdon |
| Hornady SP | 55 gr | Hodgdon Varget | 35.1 gr | 36.4 gr | 3,516 to 3,645 fps | 24″ / Test Barrel | Hodgdon |
Understanding The 220 Swift Reloading Data
Working up .220 Swift load data requires careful evaluation of technical parameters due to the blistering speeds and high operating pressures characteristic of the cartridge:
- Starting Load: The conservative minimum charge weight recommended by testing laboratories to ensure safe ignition and clean propellant combustion.
- Maximum Published Load: The absolute peak pressure threshold established by testing facilities. Exceeding this value can result in dangerous overpressure events and accelerated throat erosion.
- Velocity: Quantified in feet per second at the muzzle, indicating how efficiently a given powder charge accelerates a specific projectile weight.
- Pressure: Measured in CUP or PSI. Standard industry thresholds for the cartridge sit near 52,000 to 54,000 CUP.
- Case Capacity: The large powder capacity relative to a small .224 caliber bore means choice of propellant burn rate is critical for consistent ignition.
220 Swift Bullet Weight Reloading Data
Published .220 Swift load data spans several distinct projectile weight classes tailored primarily for long range varmint hunting and target shooting:
- 40 to 45 Grain: Ultra light options designed for maximum velocity, frequently achieving muzzle speeds exceeding 4,000 fps for flat trajectories on small pests.
- 50 to 52 Grain: The classic sweet spot for the cartridge, balancing extreme velocity with optimal aerodynamic stability in traditional twist rates.
- 55 Grain: A popular standard weight that provides dependable expansion and high energy transfer on medium sized varmints.
- 60 Grain and Above: Heavier projectiles that require faster barrel twist rates to stabilize properly, offering better wind resistance for extended distances.
220 Swift Powder Reloading Data
Selecting the correct .220 Swift powder involves matching medium to slow burning rifle propellants that maximize efficiency inside a high capacity case:
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon H-414 | Hornady SP | 40 gr | 39.2 gr | 42.1 gr | 3,923 to 4,213 fps | Hodgdon |
| Hodgdon Varget | Hornady SP | 45 gr | 37.7 gr | 40.0 gr | 3,777 to 4,002 fps | Hodgdon |
| Hodgdon H-380 | Hornady SP | 50 gr | 36.6 gr | 39.4 gr | 3,668 to 3,947 fps | Hodgdon |
| Hodgdon H-4895 | Sierra HPBT | 52 gr | 35.8 gr | 37.3 gr | 3,588 to 3,736 fps | Hodgdon |
| Hodgdon Varget | Hornady SP | 55 gr | 35.1 gr | 36.4 gr | 3,516 to 3,645 fps | Hodgdon |
220 Swift Bullet And Powder Combinations
Because the .220 Swift generates intense thermal energy, exact component selection is vital to maintain precision and barrel longevity:
- Cartridge Overall Length (COL): Standard specifications require an overall length typically set around 2.680 inches, though magazine constraints or throat dimensions may dictate minor adjustments.
- Primer Selection: Most verified recipes call for standard large rifle primers such as the Winchester WLR. Magnum primers are generally unnecessary unless shooting in sub freezing conditions with slow ball powders.
- Neck Tension and Crimping: Bullet pull should be consistent. A mild neck resize without a heavy crimp is standard for bolt action rifles chambered in this caliber.
220 Swift Velocity From Published Data
Manufacturer velocity figures are typically generated using test barrels measuring 24 inches in length. For example, pushing a 40-grain projectile with maximum charges of H-414 achieves velocities near 4,213 fps. Real world results from custom rifles with varying barrel lengths can introduce minor velocity shifts. Handloaders should always distinguish controlled laboratory chronograph measures from unverified web estimates.
220 Swift Reloading Data By Barrel Length
Barrel length directly influences final velocity outputs in high velocity rifle cartridges. While standard testing utilizes 24-inch barrels, shorter sporter tubes or longer custom barrels will yield different muzzle speeds. Shooters must account for these variations when calculating long range drops.
220 Swift Energy And Ballistics
When reviewing ballistic performance data for a standard 50-grain varmint load exiting the muzzle at roughly 3,800 fps:
- Muzzle Energy: Approximately 1,600 ft-lbs, offering explosive terminal performance on impact.
- 100-Yard Metrics: Retains flat trajectory and high energy, minimizing holdover requirements for distant targets.
- 200-Yard Metrics: Maintains high speed well past standard point blank range limits, ensuring reliable projectile upset.
220 Swift Hunting Applications
The .220 Swift data profile is optimized primarily for open country varmint and predator hunting:
- Varmint Eradication: Lightweight, thin skinned bullets driven at extreme velocities deliver immediate fragmentation and humane harvests on prairie dogs and coyotes.
- Target Shooting: Match grade bullets paired with stable powder charges yield exceptional precision for benchrest applications.
Manufacturer Data vs Independent Testing
Official laboratory data uses piezoelectric pressure barrels or copper crusher cylinders to record exact chamber metrics under controlled conditions. Independent chronograph testing by private reloaders reflects real world performance from unique factory firearms, which may introduce variations due to bore dimensions or environmental changes. Official manufacturer data should always serve as the primary reference baseline.
220 Swift Pressure And Safety
The .220 Swift operates at high working pressures and generates significant barrel heat. Because of these characteristics, safety precautions are mandatory:
- Never exceed published maximum loads or attempt to compress unverified powder charges.
- Allow adequate cooling time between shot strings to prevent excessive throat wear and heat induced pressure spikes.
- Monitor primers and case heads closely for signs of excessive pressure, such as flattening or cratering.
Best Sources For 220 Swift Reloading Data
The top references for reliable data include:
- Hodgdon Online Reloading Center: Offers extensive, pressure tested recipes covering diverse powder lines.
- Sierra Reloading Manual: Features detailed accuracy nodes and velocity tracking for .224 caliber projectile lineups.
- Lyman Reloading Handbook: Provides comprehensive data across multiple powder manufacturers using universal test receivers.
Common 220 Swift Reloading Data Questions
Where can I find .220 Swift reloading data?
Reliable data is available through official online portals and print manuals published by Hodgdon, Hornady, Sierra, and Lyman.
What powders are popular for .220 Swift?
Top performing propellants include Hodgdon H-414, Varget, H-380, and H-4895.
What bullet weights are supported?
Published data accommodates weights ranging from 40 grains up to 60 grains.
Does barrel length affect velocity?
Yes. Standard testing uses 24-inch barrels, and shorter or longer tubes will alter final muzzle velocity.
Can I use standard large rifle primers?
Yes, most published recipes specify standard large rifle primers like the Winchester WLR.