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This is Federal's answer for folks who run suppressors on 45-70 rifles and want the sonic silence to actually work. The 4570SUB1 loads a 300-grain target soft point to exactly 1,000 feet per second, sitting right at the sound barrier. That matters because it eliminates the supersonic crack that a suppressor physically can't quiet down, no matter how good it is. With a standard-velocity 45-70, you still get that sharp snap through your can. With this subsonic load, you get quiet that feels different.
Federal engineered this specifically around low-velocity performance. The bullet design handles expansion and consistency at velocities where standard ammo just falls flat. This isn't a reloader's compromise or a marginal offering. Customer feedback shows it performs reliably and runs quieter than competing subsonic 45-70 loads from other manufacturers.
The load uses Federal's proven soft point construction, selected and modified specifically for suppressor use. The 300-grain bullet weight keeps the 45-70's inherent power without pushing velocity beyond the sound barrier. This is target-grade ammo, not hunting-only stuff. Brass is clean and consistent, primers are Federal quality, and powders are tuned for low-velocity operation and reliability. You get 20 rounds per box, which makes it practical for range sessions or working up a suppressed rifle setup.
Paired with a quality suppressor, this ammo delivers the kind of sound reduction that changes how you experience the rifle. The .45-70 is already a relatively slow round compared to modern rifle cartridges, so the transition to subsonic feels less extreme than moving a .308 to subsonic speeds. You maintain reasonable trajectory for a 45-70, and at sensible hunting or target ranges, that trajectory stays manageable. The ballistic coefficient sits around .290, which reflects the subsonic design.
If you're running a Henry, Marlin, or Ruger 45-70, this ammunition makes suppressed shooting feel like the original intent. It cycles reliably, feeds cleanly, and gives you the performance you actually bought a suppressor for.
Yes. The 4570SUB1 cycles reliably in standard 45-70 rifles. The 1,000 fps velocity is still fast enough for consistent feeding and extraction. Unlike extremely light or custom subsonic loads, this Federal load maintains the standard 45-70 reliability you expect.
The subsonic design eliminates the supersonic crack that regular 45-70 ammo creates even through a suppressor. Since the bullet stays below the sound barrier, your suppressor can actually quiet the entire sound signature. Customer reports show noticeable quieter performance compared to standard-velocity 45-70 through the same cans.
At 1,000 fps with a 300-grain bullet, you have workable accuracy out to reasonable hunting and target distances. The 45-70 is already a moderate-range cartridge, and the subsonic variant doesn't significantly change that. You'll see a higher trajectory arc than standard loads, but within typical 45-70 ranges it stays predictable.
This is loaded as target ammo, though the 300-grain soft point bullet design provides expansion for small to medium game at subsonic velocities. It's better suited for range use and suppressed target shooting, but some hunters use similar loads for close-range work where the sound signature matters.
| Caliber/Gauge | .45-70 Government |
|---|---|
| Cost per Round | 2.10 |
| Grains | 300Gr |
| Manufacturer | |
| Manufacturer Part Number | 4570SUB1 |
| Model | |
| Product Type | Solid Base |
| Shipping Weight | 1.65 |
| Units per Box | 20 |
| UPC | 604544711240 |
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