Description
The Underwood 50 AE 300gr FMJ FN load, Underwood item 509, is a 20 round box of 50 Action Express ammunition loaded with a 300 grain FMJ Flat Nose bullet rated at 1580 fps with 1663 ft-lbs of muzzle energy.
Underwood 50 AE 300gr FMJ FN Overview
Underwood Ammo builds high-performance ammunition in Sparta, Illinois, and is known for loading cartridges to their full potential. Many Underwood loads run faster than typical factory ammunition while staying within safe pressure limits, and the company pairs that speed with premium bullets from makers such as Lehigh Defense and Hornady. Cases are quality brass.
Bullet Design
The full metal jacket flat nose bullet pairs a copper jacket with a wide, flat meplat. It feeds reliably, holds together on impact for straight-line penetration and is a practical choice for target practice, plinking and hunting larger game where penetration matters more than expansion.
Intended Use
This load is suited to practice, target shooting and hunting larger game where a non-expanding bullet is preferred. Always confirm reliable feeding and point of impact in your own firearm before you rely on it.
Firearm Compatibility
This ammunition is made for firearms chambered in 50 Action Express. Always check the caliber marking on your barrel or slide before loading. Underwood loads run at the upper end of safe pressure for the cartridge, so make sure your firearm is in good condition.
About Underwood Ammo
Underwood Ammo is a family-run American company that has built a reputation for powerful, accurate ammunition. Each load is developed and tested in-house, and the company publishes velocity and energy figures for every product so shooters know exactly what they are getting.
Recoil and Shootability
Expect heavy recoil and a loud, bright muzzle blast with this load. A firm grip and a heavier firearm help with control.
Why Shooters Choose Underwood
Shooters choose Underwood because the published numbers are real and the loads deliver them. Pairing premium bullets with carefully developed powder charges gives each load a clear purpose, whether that is defense, hunting or practice. Nickel or brass cases, quality primers and careful loading round out a product that many shooters trust when performance matters most.
Practice and Testing
Fire a few magazines or cylinders of this load before relying on it for defense or hunting. Confirm reliable feeding, extraction and point of impact, since fast or heavy loads can print to a different point than practice ammunition.
Choosing a Load
Choose your bullet for the job: solid copper fluid-transfer bullets for defense through barriers, expanding hollow points for controlled expansion, and hard cast or penetrator designs for large animals. Then pick a weight and speed you can shoot accurately.
Storage and Care
Store ammunition in a cool, dry place in its original boxes, away from solvents and lubricants that can contaminate primers. Inspect rounds before loading, and set aside any with dents, loose bullets or corrosion.
Specifications
- Brand: Underwood Ammo
- Item number: 509
- Caliber: 50 Action Express
- Bullet weight: 300 grain
- Bullet type: FMJ Flat Nose (full)
- Muzzle velocity: 1580 fps
- Muzzle energy: 1663 ft-lbs
- Case: Brass
- Count: 20 rounds per box
- UPC: 816874023607
- Made in the USA
- Photo note: one gallery photo shows a related Underwood load, included to show the packaging style.
Before You Buy
Federal law requires buyers of handgun ammunition to be at least 21 years old when buying from a licensed dealer. Some states and cities restrict ammunition purchases, require background checks or limit shipping, so check your local rules before you order.
Who It Is For
The Underwood 50 AE 300gr FMJ FN is a great fit for shooters who want high-performance 50 Action Express ammunition from an American maker known for powerful, accurate loads.
Buy the Underwood 50 AE 300gr FMJ FN at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Underwood 50 AE 300gr FMJ FN online and we will ship it to you where state and local law allow, or browse our full selection of ammunition for more handgun loads. For factory details, visit Underwood Ammo.
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