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Discussion Starter #1
Earlier today I was using a 9mm usp tactical with octane 45. Overall, No issues with 115 supersonic but with 147 gr ammo (900 fps) the gun would not cycle properly either with our w/o can. The subsonic ammo didn't not have enough juice to rack the slide back and load a new round into the chamber. The spent brass would get caught in the slide along with the next round going into the chamber. Very frustrating.

This same subsonic round (147 gr w/ 4.5 gr of power pistol) works fine in other guns with and w/o can.

I am thinking the serious double recoil spring system in the usp tactical is likely the culprit.

Can someone recommend what subsonic load works in usp tactical 9mm with and w/o can? Thanks.
 

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Definitely an ammo issue if it isn't working without the can. My gold standard load is Fiocchi 158 grain 9APE. Any factory 147 should work but may not stay subsonic.
 

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Discussion Starter #3
It's not cycling properly with or without the can with my subsonic ammo. Do you know how fast your 158 grain 9APE is traveling?
 

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The Librarian
MP5-N and HK23E-K
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Mine did the same thing until I broke it in about 300 rounds later with just 115 or 124 grain. I can now used Federal American Eagle, Speer and Blazer Brass 147 grain.
 

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Care to share what brand of subs you're using? Handloads? Maybe that's the problem. I've had no problems with Fiocchi 158gr, S&B 147gr and 140gr (kinda rare but GOOD), even round nose 147gr reloads. Am Eagle 147gr tnp works fine the few times I've used it in the USP (and UZI), but if you have an mp5 also it can be a little spotty on feeding.
 

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Discussion Starter #7
Barry mfg 147 hand loads with 4.5 power pistol. They cycle without issue in mk25 and mpx.
 
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