Rifle · CIP
6.5 GAP 4S
6.5 GAP 4S is a rimless bottlenecked rifle cartridge of United States origin.
- Caliber
- 0.2642″ · 6.71 mm
- Introduced
- 2019
- Case
- Rimless
- Parent
- 6.5mm DBG
- Primary use
- Hunting
- Status
- Active
- Introduced
- 2019
- Type
- Rifle
- Origin
- United States
- Inventor
- GA Precision (approx: maker of record)
- Manufacturer
- GA Precision (designer; maker of record)
- Standard
- CIP
- Status
- Active
- Availability
- Limited
- Case capacity
- 70.7 gr H₂O
- Twist (typical)
- 1:8.0
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 63,817 psi, CIP transducer
- Eff. range
- 400 yd
- Max range
- 2000 yd
- Recoil
- 14.1–16 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 6.5 GAP 4S, so this is the shape gravity alone gives the advertised velocity. Drag would steepen it. The tool below solves real loads through their published G1 or G7 model.
Open in Ballistic Compare- Parent case
- 6.5mm DBG
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
CIP TDCC · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.71 | 0.264 | ✓ |
| Neck ⌀ | 7.42 | 0.292 | ✓ |
| Shoulder ⌀ | 13.58 | 0.535 | ✓ |
| Shoulder angle | 30° | — | ≈ |
| Base ⌀ | 14.00 | 0.551 | ✓ |
| Rim ⌀ | 13.56 | 0.534 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 6.88 | 0.271 | ≈ |
| Case length | 51.18 | 2.015 | ✓ |
| Overall length | 76.30 | 3.004 | ✓ |
Size vs familiar rounds
Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. 6.5 GAP 4S is highlighted below.
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Lineage
Connected reference
History
Introduced around 2019.
FAQs
- What twist rate does 6.5 GAP 4S use?
- 6.5 GAP 4S typically uses a 1:8.0 twist rate.
- What bullet diameter is 6.5 GAP 4S?
- 6.5 GAP 4S uses a 0.2642″ (6.71 mm) diameter bullet.
- Is 6.5 GAP 4S still in production?
- 6.5 GAP 4S is active; typical availability is limited.
- What is 6.5 GAP 4S used for?
- 6.5 GAP 4S is primarily used for hunting.
- What is 6.5 GAP 4S based on?
- 6.5 GAP 4S is derived from the 6.5mm DBG case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
