Winchester
Winchester 571
A slow-burning shotshell BALL POWDER used for heavy magnum field and waterfowl loads before it left the catalogue.
Discontinued. A slow shotshell ball powder for heavy magnum 12 and 10 gauge waterfowl loads, from an era when heavy lead magnum payloads were the point. Nothing in the current Winchester line replaces it exactly. Archived data only, and only for the exact hull, wad and payload.
- heavy 12 gauge waterfowl loads
- 10 gauge magnum loads
Who has Winchester 571 today
Checked October 10None of the retailers we track list Winchester 571 right now. See what is in stock.
Discontinued. Canisters still circulate, but the maker no longer produces it — and load data for it may be withdrawn or archived.
Official Winchester load data →
Specifications
| Manufacturer | Winchester |
|---|---|
| Product family | Winchester |
| Status | Discontinued |
| Application | shotshell |
| Grain form | spherical |
| Composition | double-base |
| Typical cartridges | 12 Gauge, 10 Gauge |
Grain shape
Spherical ball, degressive, and slow for a shotshell powder; the heavier deterrent treatment on the spheres is what lets it push a heavy payload without spiking early. It meters well, as ball powders do.
Why geometry decides burn rate more than chemistry does: Shape Is the Product.
Discontinued. Winchester and Hodgdon no longer list this powder among current Winchester canister products and it does not appear on Hodgdon's current relative burn rate chart. No manufacturer product page remains; use only data from an archived manufacturer manual.
This powder is obscure enough in the US that its practical character is thinly documented. The note above is deliberately short rather than padded.
Data confidence
We flag entries we could not fully verify rather than presenting them as solid:
- Discontinued — no live manufacturer product page; details drawn from archived or secondary manufacturer material.
Sources
The specifications above come from Winchester's own published documentation, linked below. The two “RCM's read” sections are ours, not theirs — our assessment of what this powder is like to load, drawn from its published characteristics and from what handloaders consistently report. No manufacturer endorses them and no source below backs them. If you think we have one wrong, tell us — we would rather fix it.