Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For cowboy action shooters running 45-70 Government rifles, the Winchester Super X Cowboy Action load balances authentic ballistics with shootability across long match strings. Introduced under Winchester’s Super-X line — in continuous production since 1922 — this 405-grain flat nose load exits the muzzle at 1150 fps and delivers 1189 foot-pounds of energy. That velocity keeps trajectory predictable out to 100 yards while keeping felt recoil under the threshold that causes flinch during timed stages. The flat nose profile feeds reliably in tubular magazines and cuts clean scoring rings on steel. Winchester loads these rounds in boxer-primed brass cases, making them fully reloadable when you need to stretch your practice budget.
Performance at a Glance
| Spec | Value |
|---|---|
| Caliber | 45-70 Government |
| Bullet weight | 405 grains |
| Bullet type | Flat Nose |
| Muzzle velocity | 1150 fps |
| Muzzle energy | 1189 ft-lbs |
| Rounds/box | 20 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Intended use | Range & Target |
| Manufacturer | Winchester |
The 405-grain flat nose sits at the traditional weight standard for 45-70 Government loads dating back to military adoption in 1873. This load runs subsonic at standard atmospheric pressure but stays supersonic rated for consistent expansion in mild temperature swings. Non-corrosive primers and reloadable brass cases extend the value proposition when you’re burning through cases of ammunition during match prep. For more cowboy action loads and historic calibers, explore our 45-70 ammo selection.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Treat every firearm as if it is loaded; keep muzzle pointed in a safe direction at all times
- Verify current state and local laws governing ammunition possession, storage, and transport in your jurisdiction
- This product contains lead; wash hands after handling and follow California Proposition 65 warnings for reproductive harm exposure
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