Description
The Buffalo Bore Heavy Outdoorsman 37B20 is a full-power .327 Federal Magnum round that hits different from standard factory loads. Built around a 130-grain hard cast Keith-style bullet, these rounds deliver serious penetration without expansion, making them ideal for hunting larger game or predator defense where deep, straight-line penetration matters most.
Flash-Suppressed Powder for Low-Light Performance
One of the standout features here is the flash-suppressed powder formula. If you ever need to fire in low-light conditions, you won't be blinded by your own muzzle flash. That's a practical benefit that makes a real difference when visibility is already compromised. The powder burns cooler and cleaner without sacrificing the velocity you need.
Penetration Over Expansion
These rounds won't expand on impact. Instead, they're engineered for maximum penetration, which is exactly what you want if you're after larger game like hogs, bears, or taking long-range shots through brush and barriers. The hard cast construction means you get consistent performance round after round. Testing shows penetration exceeding three feet in 10% ordnance gelatin, with muzzle velocities around 1,300 fps from standard revolvers.
Built for All-Steel Revolvers
Buffalo Bore engineered these loads to be safe in all-steel revolvers and standard pistols without putting extra wear on your firearm. They perform like full-power magnum rounds should, but without punishing your gun. The only caution is with super-lightweight alloy revolvers, where the recoil can potentially cause bullet crimp jump. This is a quality control note, not a fundamental flaw. The ammunition itself is new production, non-corrosive, and loaded into reloadable brass cases so you can reload if you choose.
Key Specifications
- Caliber: .327 Federal Magnum
- Bullet Weight: 130 grains
- Bullet Type: Hard Cast Keith-Style
- Rounds Per Box: 20
- Muzzle Velocity: 1,300 fps
- Muzzle Energy: 488 ft-lbs
- Case Material: Brass
- Primer Type: Boxer (reloadable)
- Manufacturer: Buffalo Bore Ammunition
- Manufacturer Part Number: 37B20
- UPC Code: 651815037028
What’s Included
- 20 rounds of .327 Federal Magnum ammunition
- Reloadable brass cases
Frequently Asked Questions
Will Buffalo Bore 130 grain hard cast work in my lightweight revolver?
Buffalo Bore recommends against using these loads in super-light alloy frame revolvers because the heavy recoil can cause bullet crimp jump. All-steel revolvers and standard pistols are no problem at all. If you have a lightweight alloy frame gun, you'll want to look at lighter loads instead.
How does the flash-suppressed powder in this ammo help?
The special powder formula significantly reduces muzzle flash, which is a big advantage if you ever need to fire in low-light situations like dawn, dusk, or night. Normal magnum ammunition can create enough flash to temporarily blind you, but these rounds burn much cleaner so your eyes stay adjusted to what's around you.
What's the best use for 130 grain hard cast rounds?
These are designed primarily as hunting and predator defense rounds where deep penetration is what counts. The hard cast bullet doesn't expand, so it punches straight through to vital organs or bone. They work well on hogs, deer, bears, and other game where you need maximum penetration over expansion.
Are these ammunition cases reloadable?
Yes. These come in new production, boxer-primed brass cases, which means you can reload them after firing if you have the equipment and knowledge to do so. That makes them a good value proposition over time if you plan to reload.




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