Winchester
Winchester AutoComp
Built for competition race guns running compensators, with a burn speed chosen to deliver a higher gas volume to the compensator. Winchester states competitors get faster follow-up shots with minimal muzzle flash.
Official Winchester load data →
Specifications
| Manufacturer | Winchester |
|---|---|
| Product family | Winchester |
| Status | Currently produced |
| Application | pistol |
| Grain form | spherical |
| Composition | double-base |
| Temperature stable | Not marketed as temperature-stable |
| Flash suppressant | Yes |
| Burn-rate position | 48 of 198 (fastest = 1) — what this means |
| Typical cartridges | 38 Super, 9mm Luger, 45 ACP, 40 S&W |
Winchester canister propellants are spherical BALL POWDER products made in the USA; the round kernels meter precisely through volumetric powder measures. Not listed as temperature stable.
Burn rate
Medium handgun speed, slower than Winchester Super Field and faster than Winchester 572.
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 BE-86 (position 45)
- Accurate No. 5 (position 46)
- Hodgdon HS-6 (position 47)
- Hodgdon CFE Pistol (position 49)
- Ramshot True Blue (position 50)
- Ramshot Silhouette (position 51)
Sources
Other Winchester 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.