.40 compact ammo picky - MP-Pistol Forum

.40 compact ammo picky

This is a discussion on .40 compact ammo picky within the MP Pistol Tech Help forums, part of the Smith & Wesson MP Forum category; So my .357c I got used came with a .40 barrel. It shot the few federal .40 hollow point rounds i had on had fine. ...


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Old June 7th, 2015, 10:06 PM   #1
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.40 compact ammo picky

So my .357c I got used came with a .40 barrel. It shot the few federal .40 hollow point rounds i had on had fine. Bought some cheap Perfecta FMJ flat nose ammo and it won't even chamber without jamming, and jams every single round with the round getting stuck going into the chamber. A pull on the slide is needed to feed it. It's like the back of the round won't slide up the breach face smoothly enough, but ive cleaned and oiled and still the same. I read about this ammo in other .40 MPs and some have my same problem, others say it shoots fine. This is to be my carry piece so I'm worried that it is so picky about ammo, even my cheap Hi-Point .40 fires anything I feed it.
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Old June 8th, 2015, 12:30 PM   #2
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You might try giving your feed ramp a nice polish. I have the 40C and haven't had any issues with it. I feed it anything, even a steady diet of tula steel when ammo was so hard to find
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Old June 8th, 2015, 06:01 PM   #3
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Picked up some more federal HP's and they shot alot better but two times it "tried" to jam, as the slide chambered the next round it like it hesitated then went in. I took the berrel out and find that putting a round in by hand at the same angle as it feeds, its like the very front of the case gets hung up going into the chamber. Maybe polishing the chamber? It looks good with no burs tho
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Old June 8th, 2015, 10:13 PM   #4
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This right here should fix your wagon. I do not own a semi-auto that I have not mirror polished the feed ramp on. Once you do it is as smooth as glass things tend to hang up a lot less then :-)

If you need instructions on how to do it with a simple dremel tool, feel free to PM me

20150609_020953_resized.jpg
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Old June 9th, 2015, 01:23 AM   #5
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I've got about 1250 rounds through my 40c. Assorted hollow points and PMC fmj. No problems at all. If polishing the feed ramp doesn't resolve the problem, either take it to a gunsmith you trust or send it to the home office. They're pretty good about warranty work.
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Old June 9th, 2015, 10:32 AM   #6
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I'll try that and hope it helps, thanks
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Old June 16th, 2015, 07:40 PM   #7
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Never needed to polish an M&P to get it to feed. I'd say it is something else. Perhaps the gun is dry or needs a new recoil spring?
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