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Discussion Starter #1
Well...I finally sent my P320 back for the safety upgrade. I only did this because I started to experience malfunctions with it. All of the malfunctions were failure to feed. It did it with Rem GS 165/180, Fed HST 165 and Win Ranger T 165/180 plus my reloads which are to SAAMI spec on COAL and at 7.5 grains of Longshot using a Zero 165 JHP and Rem 165 GS. Now this load is not a ***** cat but it is certainly not max. Sig replaced the extractor and barrel and included two box labels of Fed HST 165 and Win Ranger 165 with the repaired pistol. These loads work flawlessly in my 2022, 224 and my 226 loves them.

I fired the repaired pistol today along with the 2022, the 320 fired about 10 rounds before FTF again, it appears the slide is moving too fast as the rounds are getting hung up on the feed ramp. I would like to replace the recoil spring with a heavier spring to see if the pistol will feed.

BTW I did shoot a box of factory Rem 165 GS through it without any problems but....my other Sigs eat these rounds like candy. Any suggestions on where to find a heavier recoil spring or if I need to replace the guide rod with a aftermarket unit in order to use a heavier spring I would be willing to do that too. Thanks...
 

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There have been several threads recently on .40 and .357 sig recoil springs. There have been many good posts, but I'm not sure that a specific solution has been found. TG
 

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Wolff Gunsprings might have them.
 

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You said that "the rounds are getting hung up on the feed ramp."

If they are nose diving and hanging at the bottom of the ramp, the real issue is probably weak magazine springs.
 
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https://www.dpmsystems.com/

I know nothing about them and another poster, on another thread, stared that after 3 rounds he determined that the system was not any good. I'm not sure how that can be determined after 3 rounds but that was the statement. Again, I have no experience with them. I'm just giving a link. TG
 

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Discussion Starter #9
I agree with this. Might be time for new mag springs.
I just havent seen any springs available for p320 mags yet.

I thought about that too, one of the three mags has a very weak spring but like I said the pistol will feed factory rounds okay. The problem is with my reloads, they are to SAAMI spec length wise and the powder charge is under max. Some are the 165 Rem GS with Longshot powder, they won’t feed in the P320 but factory Rem 165 GS will. It leads me to believe the slide may need to be slowed down some. You can definitely feel the factory loads are weaker and I think the hand-loads are causing the slide to move too fast. Again these loads are under max and are to SAAMI specs and they feed through the other Sigs just fine.
 

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Stop shooting any reloads and use only new factory ammo for a while... If it shoots all the factory ammo, then your reloads are the issue, regardless of what specs you're maintaining... I suspect the 40cal p320, unlike other Sig 40cal pistols, is more sensitive to COAL, so they need to be on the shorter side of SAAMI specs.

Three things I'd do: clean insides of mags, install new mag springs, and polish the feedramp.
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I thought about that too, one of the three mags has a very weak spring but like I said the pistol will feed factory rounds okay. The problem is with my reloads, they are to SAAMI spec length wise and the powder charge is under max. Some are the 165 Rem GS with Longshot powder, they won’t feed in the P320 but factory Rem 165 GS will. It leads me to believe the slide may need to be slowed down some. You can definitely feel the factory loads are weaker and I think the hand-loads are causing the slide to move too fast. Again these loads are under max and are to SAAMI specs and they feed through the other Sigs just fine.
That is what makes me think new spring might help. I too have noticed P320 mag springs seem a littel weak. As your slide is moving faster if a weak mag spring isnt getting the round out as fast it will cause a FTFeed.

Someone said Glock mag springs work (and wolff makes a +10%) but I have not tired any heavier springs yet myself.
 
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