Underwood ammunition in .444 Marlin (brand part no. 554) is a hunting camp staple for shooters who want a dependable big-game round. Underwood manufactures this load to consistent tolerances, so every box performs the same as the last. At the heart of this load is the 220 gr bullet with an Xtreme Penetrator design, matched to the .444 Marlin platform shooters already run. In our rifle ammunition lineup, this is the Underwood load built for that job.

Key Specifications

• The chambering is .444 Marlin, a caliber that has taken game across North America for generations.
• The bullet weighs 220 gr, sized for the terminal performance this load is built around.
• The projectile is an Xtreme Penetrator design, designed for reliable expansion on game.
• Muzzle velocity is rated at approximately 2660 fps, keeping the load fast enough for dependable terminal performance.
• Each box holds 20 rounds, a practical quantity for a solid range session without restocking mid-way.
• Cases ship 10 boxes to a case, letting range regulars order in volume without repeat checkout.
• Cost works out to about $3.66 per round, a reasonable cost for this level of quality.
• This is a centerfire cartridge, ignited by a replaceable primer rather than a rimfire priming ring.
• The bullet is a solid, non-expanding penetrator, engineered to drive straight through heavy muscle and bone for a full-diameter wound channel instead of mushrooming on impact.

Frequently Asked Questions

Does this bullet expand on impact? No, the Xtreme Penetrator is a solid, non-expanding design built to drive straight through deep muscle and bone rather than mushroom, maximizing penetration on tough, heavy game.

How many rounds come in a box? Each box holds 20 rounds of .444 Marlin.

How fast does this .444 Marlin load run? It’s rated at approximately 2660 fps at the muzzle, giving a sense of the energy and trajectory to expect.

Buy the Underwood .444 Marlin 220 gr Xtreme Penetrator, 20-Round Box

Whether it’s a weekend at the range or opening morning, this is the load that shows up and does its job. Order from our Lubbock, Texas gun shop and it ships fast to your door.