Is it me or the gun? Sig p320c 9mm question

Discussion in 'Shooting & Fireams Training / Skills' started by Backwoods Runner, Nov 22, 2018.

  1. Backwoods Runner

    Backwoods Runner Member

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    Hi all, so got my sig p320c 9mm out for the first time last night. Shot about 100 rounds of cheapo fmj just getting used to it and i was relatively satisfied with my accuracy, by no means my best but definitely not my worse and I was improving and getting used to the new gun. Then I decided to run some carry ammo through it, federal 124 grain hst is my go to, first mag was okay, but not what I expected... second mag was completely junk, like 18 inch group at 50 feet... (all of my shooting was two handed unsupported) then I decided to run some Hornady critical defense 115 grain through it (I don't like this ammo but I had a bunch for some reason) on the pic below that is going to be the group on the head, 2 flyers but I was very happy for the speed I was shooting, dropped the empty mag and put another with the federal in and shot the group in center mass... same lighting grip, and shooting speed. Any idea why the federal group is so much worse than the hornady? I'm assuming it's me I just can't place exactly what I'd be doing differently between the two. Other than shooting my favorite ammo like crap I love the new sig, ran flawlessly and is a very smooth feeling gun.
     

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  2. Kevo

    Kevo Member

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    Some guns do seem to cycle and react a bit different to different ammo, but this is a pretty huge difference. Any chance you might have a little flinch going with the heavier 124gr rounds? A good test for this is to have a buddy stick a snap cap somewhere in the middle of a mag without showing you.
     
  3. Backwoods Runner

    Backwoods Runner Member

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    I was thinking that could be possible but I carry a .40 p229 for work and with the 40 I shoot groups like the critical defense group above, my other thought is the weight (almost 10 ounces lighter) than the 229 is throwing me off and possibly giving my a very slight flinch with the 124. I am going to go to another range and work from 3 yards out to the longer ranges, the range I was on last night I wasn't able to shoot any closer than 50 feet. Alot of my training had been starting at 3 yards and then moving back and I found that is very beneficial since I don't move back until I have that distance from the target figured out.
     
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  4. Hammer

    Hammer Member

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    I'd guess that it's the result of a little more felt recoil with the heavier rounds (and thus maybe a little flinching) than you're used to on your heavier P229. Even though you're used to shooting .40 my experience with a P229 chambered in .40 is that it is actually very reasonable recoil. On the other hand, a 124 gr round out of a 3.9" barrel on a gun that weights well over 27 oz loaded isn't a 'heavy' load, imo. Interesting results, for sure.

    When you started out shooting cheapo FMjs, what grain weight were those?

    Regardless, I think you're taking the right next steps - start shooting much closer to the target and then work your way out. Keep us posted.
     
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  5. Backwoods Runner

    Backwoods Runner Member

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    115 grain remington umc, also going to get some different ammo, I have been considering switching to sig v-crown for carry ammo, started using it in my p220 and I have noticed it seems to be available and in stock nearly everywhere now where as the federal can be tough to find in my less than freedom loving state.
     
  6. Hammer

    Hammer Member

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    I've also noticed that HST has been a little hard to find lately, even in my extremely freedom-loving state. I think it's just become a very popular defense round, and for good reason. It's certainly my go-to defense round these days.

    It would be interesting to run some 124 gr FMJs, and see how that compares to the results you got with the 124 gr. HSTs.
     
    Last edited: Nov 22, 2018
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  7. OKcherokee

    OKcherokee Member

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    Have someone else shoot it.
     
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  8. Rick R

    Rick R Member

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    Guns can be finicky, luckily you have options. I like the 9mm Speer Gold Dot 124gr and Winchester bonded +P loads, but the SIG V Crown has a great rep and shoots well in both my 10mm pistols. I’d try those three rounds before worrying about my new gun.

    Also, the 147gr stuff is everybody’s current darling, I like 124gr better but you might try some and see how it does.
     
  9. Stray Round

    Stray Round Member

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    Dry fire a bunch.
    Load some dummy rounds randomly in the magazine and then stare a hole at your front sight and stay focused on that front sight as it lifts during recoil.
     
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  10. Buckeye67

    Buckeye67 Member

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    It looks like grip and index are the primary culprit there.
     
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  11. Backwoods Runner

    Backwoods Runner Member

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    I did notice it felt like my trigger finger was sliding to far over on the trigger, the p320 trigger feels narrower than my P229 trigger, kinda tempted to try a flat trigger on the p320.
     
  12. Black5

    Black5 Member

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    Not meaning to butt in, but does the 320 have an interchangeable grip?

    In my family we have several Sig pistols, particularly the 2022. We've found changing the grip makes a tremendous difference in accuracy depending on the shooter's hand size.

    If the gun feels different, you may shoot different.
     
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  13. Backwoods Runner

    Backwoods Runner Member

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    It does! That is one of the big selling points of these, the entire frame is called a "grip module" and is not serialized the serialized part is the "fire control unit" or fcu, the fcu is the trigger mechanism it is in a stainless steel chassis that pops into the grip frame. So the grip modules are about 45 bucks and come is the sub compact, compact, carry, and full size proportions, and each one of those comes in small medium and large hand sizes, as well as the x series which are a different shape grip. I'm actually planning to visit the sig factory/pro shop in exeter NH at the end of this week so I'm gonna check out the different sizes in person (I want to get one in olive drab color as well lol)
     
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  14. Black5

    Black5 Member

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    I wish I could go there, but my wife and banker have expressly forbidden it.:(
     
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  15. Backwoods Runner

    Backwoods Runner Member

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    Figured I'd update this, been shooting the p320 a fair bit and I now have absolutely no problems with it. In fact I shoot it better than any of my other pistols now. Last night I shot a few mags through, started at the 25 yard line and with aimed rapid fire 4 out of 5 head shots and one flyer into the shoulder, I'll take that!
     
  16. Menace

    Menace Member

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    Good to hear
     

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