Accurate
Accurate 1680
Serves both small-capacity rifle cartridges and large-capacity, high-performance handgun cartridges.
Specifications
| Manufacturer | Accurate |
|---|---|
| Product family | Accurate |
| Status | Currently produced |
| Application | rifle, pistol |
| Grain form | spherical |
| Composition | double-base |
| Temperature stable | Not marketed as temperature-stable |
| Burn-rate position | 81 of 198 (fastest = 1) — what this means |
| Typical cartridges | 22 Hornet, 7.62x39mm, 454 Casull, 460 S&W Magnum, 500 S&W Magnum |
Hodgdon flags it as an extra-clean-burning powder. Its spherical grain meters well through progressive equipment.
Burn rate
Very fast for a rifle powder, charted immediately after Accurate 5744 and ahead of Accurate LT-30.
Chart agreement: consistent across charts - listed in the same relative neighbourhood by every publisher that carries it Ranked by: Hodgdon, Vihtavuori, Shooters World, Wolfe/LoadData.
Powders charted near it — neighbours on the chart are not substitutes, and adjacency tells you nothing about what charge either one takes:
- Alliant Power Pro 300-MP (position 78)
- Accurate 5744 (position 79)
- Shooters World Buffalo Rifle (position 80)
- Shooters World Blackout (position 82)
- Accurate LT-30 (position 83)
- Hodgdon CFE BLK (position 84)
What reloaders say about it
Unverified community anecdote. The following is a summary of what handloaders report in public forums. It is not manufacturer information, it has not been tested, it may be wrong, and it contains no load data by design. Treat it as colour, not guidance.
1680 is repeatedly named as the go-to for .300 Blackout subsonic loads by users who tried to make a single powder cover both subsonic and supersonic and gave up.
- strong following for .300 Blackout subsonics
- users report H110 alone would not cover both subsonic and supersonic for them
Availability: Not flagged as scarce in these threads.
Consensus level: commonly mentioned. Drawn from thread 1.
Sources
Other Accurate powders
Verify the charge, not just the recipe
Good data gets you a safe starting point. It does not tell you what actually went into the case on stroke 340 — a bridged measure, a double charge, a squib. That is what an RCM Laser Powder Check is for.