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A Federal .45 ACP HST bullet (P45HST2) emerging from, but still in, the 5" barrel of an S&W Model 4506, complete with gas being blown ahead of it. (Average muzzle velocity 900 fps, 414 ft-lbs of energy, and 21,000 psi.) Note the amount of infrared light that's being emitted around the bullet, and the little smoke plume above the ejection port. The action was caught using an invisible infrared trigger beam system (1,000,000th-second response time). Flash duration was 1-2,000,000th-second.
 

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Also, note that the slide is 'just' beginning to recoil but is still locked with the barrel.
 

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I would not want to be on the wrong end.

I shoot (carry) Federal HST in 40cal at 180 gr. Took a glossy paged catalog (2.5-3 in thick) to the range a couple weeks ago and shot one HST and one Winchester 180gr FMJ. The FMJ exited with about a 1.5 in hole, the HST atleast 3-4 inch,,, massive :shock: :!:
 

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As soon as I shoot out my current carry rounds I am switching to Federal HST. From all accounts I have seen, it has consistently large expansion and little fragmentation/jacket separation.
 
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