Underwood Ammo Maximum Expansion .300 Blackout 194-grain Solid Monolithic ammunition (brand part no. 452) is tuned specifically for pistol-length barrels, giving short-barreled .300 Blackout platforms full velocity potential. Underwood Ammo builds the bullet from Lehigh’s Maximum Expansion Technology, a lead-free solid copper design that opens into razor-sharp petals on contact with a fluid-based medium like tissue, rather than deforming against hard surfaces the way a traditional jacketed bullet does. Those petals lock at their widest diameter instead of folding back, cutting a larger wound channel than a conventional expanding bullet of the same caliber. For shooters running AR pistols or short-barreled .300 Blackout rifles who want dedicated defensive performance, this load is built around that platform specifically.
Key Specifications
- The chambering is .300 AAC Blackout, a cartridge purpose-built for short-barreled rifles and AR pistols.
- The bullet weighs 194 grains, a heavy-for-caliber weight tuned for pistol-length barrel velocities.
- The bullet is a solid monolithic, lead-free copper design built with Lehigh’s Maximum Expansion Technology.
- On impact with tissue, the bullet’s petals expand and lock at maximum diameter, cutting a wound channel wider than a traditional mushrooming bullet.
- The load is optimized for pistol-length barrels, tuned to reach its intended velocity in short-barreled .300 Blackout platforms.
- Cases are made of nickel-plated brass, resisting corrosion and feeding smoothly through semi-auto actions.
- Each round costs about $3.30, reflecting the machined solid-copper defensive bullet.
- Each box holds 20 rounds, a practical quantity for a specialty defensive load.
- A full case packs 10 boxes for 200 rounds total, useful for shooters who want a deeper defensive supply.
Frequently Asked Questions
Does this bullet expand like a standard jacketed hollow point? No, Lehigh’s Maximum Expansion Technology opens through hydraulic pressure against tissue and does not expand against dry, hard surfaces the way a traditional jacketed bullet does.
Is this load meant for short-barreled platforms? Yes, it is specifically optimized for pistol-length barrels, so AR pistols and short-barreled .300 Blackout rifles get its full intended velocity.
How many rounds come in a full case? A case contains 10 boxes of 20 rounds each, for 200 rounds total.
Buy Underwood Maximum Expansion .300 Blackout 194gr
Short-barreled .300 Blackout platforms need a load engineered around their velocity window, not a rifle load hoping to keep up, and Maximum Expansion was built for exactly that role. Round out your rifle ammunition supply with a load matched to your platform. Order from our Lubbock, Texas gun shop and it ships fast to your door.
