Underwood Ammo built its 10mm Auto 180-grain full metal jacket flat nose load (brand part no. 241) for woods carry, where the target might be a hog or a black bear rather than a person. The FMJ-FN bullet is intentionally non-expanding, and its flat nose is shaped to punch through dense muscle and bone while holding its nose-forward orientation, unlike a round nose bullet that can deflect off an angled hit. Underwood also loads the round with flash-suppressed powder, protecting a hunter’s night vision if a follow-up shot is needed in low light. Field-tested in real, commonly owned pistols rather than test barrels, it is built as a dedicated deep-woods defense round for 10mm Auto handguns.

Key Specifications

• The chambering is 10mm Auto, a high-energy semi-auto cartridge favored for woods carry.
• The bullet weighs 180 grains, a mid-weight choice that balances velocity and penetration in 10mm.
• Bullet construction is full metal jacket, flat nose (FMJ-FN), a non-expanding design.
• The flat nose is shaped to punch through dense muscle and bone while holding its nose-forward orientation for maximum penetration.
• Because the bullet does not expand, it is built for deep, straight-line penetration rather than a wide wound channel.
• Underwood loads the round with flash-suppressed powder, protecting night vision if a follow-up shot is needed in low light.
• Cases are nickel-plated brass, supporting smooth feeding and reliable extraction.
• Rounds are packaged 50 per box, with 10 boxes to a case, for a 500-round case option.
• Cost runs about $0.88 per round, reasonable for a purpose-built woods-defense load.

Frequently Asked Questions

What is this load designed for? Underwood built the FMJ-FN bullet for woods defense against hogs and black bears, not for personal defense against people.

Does the flat nose bullet expand? No, it is a non-expanding design meant to penetrate deeply while holding its nose-forward orientation through dense muscle and bone.

Buy Underwood Ammo 10mm Auto 180gr FMJ Flat Nose

Hiking or working in bear and hog country calls for a 10mm load built specifically for that threat, and this FMJ-FN is designed around deep penetration rather than expansion. Keep a box in your pack or on your hip where a follow-up shot might come in low light. Browse more of our handgun ammunition selection and order from our Lubbock, Texas gun shop for fast shipping to your door.