7U1 Subsonic
- Cartridge
- 5.45x39mm
- Bullet weight
- 5.20 g
- Reference velocity
- 303 m/s
- Muzzle energy
- 239 J
Specification
The load, and the figures its drawing is made from
IdentityWho makes it, and what it is for.
- Designation
- US
- Maker
- Various
- Country of origin
- Soviet Union
- Introduced
- 1980
- Military load
- Yes
- Widely available
- No
ProjectileThe figures the drawing and the solver start from.
- Bullet type
- FMJ
- Cartridge
- 5.45x39mm
- Bullet diameter
- 5.6 mm
- Bullet weight
- 5.2 g (80.2 gr)
- Sectional density
- 0.229
- Ballistic coefficient (G1)
- 0.35
- Reference velocity
- 303 m/s (994 ft/s)
- Reference barrel
- 415 mm
- Velocity retention exponent
- 0.12
Ballistics
Downrange, solved
Solved at the reference barrel of 415 mm from the G1 coefficient and the load's velocity retention. A different barrel gives a different curve.
At the muzzle
What leaves the barrel
MuzzleThe solver’s figures at the reference barrel, where the curve starts.
- Muzzle energy
- 239 J
- Effective range
- 181 m
- Momentum
- 1.58 kg m/s
- Taylor knockout factor
- 2.5
- Hatcher relative stopping power
- 6
- Energy density
- 969.2 J/cm²
Downrange
Point by point
The same solution as the chart, at each distance the solver reports.
| Distance | Velocity | Energy | Drop | Time of flight | Mach |
|---|---|---|---|---|---|
| 0 m | 303 m/s | 239 J | 0 cm | 0 s | 0.88 |
| 50 m | 292 m/s | 221 J | 13.9 cm | 0.168 s | 0.85 |
| 100 m | 282 m/s | 206 J | 57.6 cm | 0.343 s | 0.82 |
| 200 m | 264 m/s | 182 J | 246.9 cm | 0.71 s | 0.77 |
| 300 m | 250 m/s | 162 J | 592.3 cm | 1.099 s | 0.73 |
| 400 m | 236 m/s | 145 J | 1119.8 cm | 1.511 s | 0.69 |
| 500 m | 224 m/s | 130 J | 1858.2 cm | 1.946 s | 0.65 |
| 600 m | 212 m/s | 117 J | 2839.2 cm | 2.406 s | 0.62 |
| 800 m | 192 m/s | 95 J | 5666.6 cm | 3.399 s | 0.56 |
| 1000 m | 173 m/s | 78 J | 9920.8 cm | 4.497 s | 0.50 |
API
The call that returns this record
The same fields, in the same units, from the same endpoint the page reads.
curl --request GET \ --url 'https://api.gunspec.io/v1/ammunition/7u1' \ --header 'X-API-Key: your_key'