7T3M Improved Tracer
- Cartridge
- 5.45x39mm
- Bullet weight
- 3.23 g
- Reference velocity
- 883 m/s
- Muzzle energy
- 1259 J
Specification
The load, and the figures its drawing is made from
IdentityWho makes it, and what it is for.
- Designation
- 7T3M
- Maker
- Various
- Country of origin
- Russia
- Introduced
- 1990
- Military load
- Yes
- Widely available
- No
ProjectileThe figures the drawing and the solver start from.
- Bullet type
- Tracer
- Cartridge
- 5.45x39mm
- Bullet diameter
- 5.6 mm
- Bullet weight
- 3.23 g (49.8 gr)
- Sectional density
- 0.142
- Ballistic coefficient (G1)
- 0.28
- Reference velocity
- 883 m/s (2897 ft/s)
- Reference barrel
- 415 mm
- Velocity retention exponent
- 0.19
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
- 1259 J
- Effective range
- 469 m
- Momentum
- 2.85 kg m/s
- Taylor knockout factor
- 4.5
- Hatcher relative stopping power
- 30
- Energy density
- 5112.4 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 | 883 m/s | 1259 J | 0 cm | 0 s | 2.57 |
| 50 m | 853 m/s | 1174 J | 1.6 cm | 0.058 s | 2.49 |
| 100 m | 823 m/s | 1093 J | 6.8 cm | 0.117 s | 2.40 |
| 200 m | 763 m/s | 940 J | 29.1 cm | 0.244 s | 2.22 |
| 300 m | 704 m/s | 801 J | 70.8 cm | 0.38 s | 2.05 |
| 400 m | 647 m/s | 675 J | 136.8 cm | 0.528 s | 1.88 |
| 500 m | 589 m/s | 560 J | 233.6 cm | 0.69 s | 1.72 |
| 600 m | 532 m/s | 457 J | 370.1 cm | 0.869 s | 1.55 |
| 800 m | 418 m/s | 282 J | 818.3 cm | 1.292 s | 1.22 |
| 1000 m | 311 m/s | 156 J | 1679.4 cm | 1.85 s | 0.91 |
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/7t3m' \ --header 'X-API-Key: your_key'