This 50 AE load (509) delivers serious handgun power for shooters who need deep-driving performance from a heavy semi-auto platform. Underwood loads it with a 300 grain full metal jacket flat nose bullet. That bullet gives the round a tough, non-expanding profile. It also adds a wide, flat striking surface. As a result, this load favors straight penetration and hard impact over rapid expansion.
Underwood rates this ammunition at 1,580 fps with 1,663 ft-lbs of muzzle energy. Therefore, it sits far above ordinary handgun power levels. The 300 grain bullet carries real momentum. Meanwhile, the 50 AE case gives it the fuel to hit with authority. This is the kind of load built for large-frame pistols that can handle serious recoil and serious pressure.
The FMJ-FN bullet makes sense for dangerous-game use where penetration matters. It does not waste energy by opening too quickly. Instead, it keeps its shape and drives forward. Moreover, the flat nose helps deliver a harder impact than a round nose profile. That matters when the target is large, dense, or heavily built.
Recoil will feel stout. However, experienced shooters usually expect that from 50 AE. A proper grip, strong stance, and reliable pistol matter here. Consequently, this load belongs with shooters who understand heavy handgun performance and want a round that hits like a hammer.
Each box contains 20 rounds. Each case includes 10 boxes, totaling 200 rounds. Underwood loads this ammunition in brass cases with Boxer primers, so reloaders can recover valuable fired brass.
This is not casual range ammunition. It is a hard-hitting 50 AE load with speed, mass, and penetration-focused construction.
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