Winchester
Winchester Super Field (WSF)
Winchester's stated powder of choice for 20-gauge AA target loads, and a good fit for maximising velocity in heavier 12-gauge payloads. It also serves action-pistol loads in 9mm, 38 Super and 40 S&W.
Official Winchester load data →
Specifications
| Manufacturer | Winchester |
|---|---|
| Product family | Winchester |
| Status | Currently produced |
| Application | shotshell, pistol |
| Grain form | spherical |
| Composition | double-base |
| Temperature stable | Not marketed as temperature-stable |
| Burn-rate position | 42 of 198 (fastest = 1) — what this means |
| Typical cartridges | 12 Gauge, 20 Gauge, 9mm Luger, 38 Super, 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-fast shotshell and handgun speed, slower than Winchester 231 and faster than AutoComp.
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:
- Shooters World Ultimate Pistol (position 39)
- Vihtavuori N330 (position 40)
- Alliant Herco (position 41)
- Shooters World Auto Pistol (position 43)
- Vihtavuori N340 (position 44)
- Alliant BE-86 (position 45)
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.