ChrisRR Posted July 17, 2018 Share Posted July 17, 2018 So, I have an older STI Edge 40S&W (about 10 years old) with perhaps approaching 10k rounds through it. I'd like to sell it, make room in the safe and all that, but it suffers from an accuracy issue I've not been able to get to the bottom of. The pistol is reliable and appears to lock up/head space correctly but groups at 30 yards are less than impressive. Shooting 200gr plated bullets (0.40", 170PF) I'll see 8" with fliers out to 12". Shooting 165gr plated projectiles (0.40", 170PF) sees the group shrink to 5" or so. The coated lead projectiles I normally shoot were awful, some not even connecting with the IPSC classic target (30 yards). I thinking the bore of the barrel may be the issue rather than the barrel fitment given the way groups vary with projectile type? If so, I guess the thing to do is fit another barrel. The current barrel slugs at 0.40... Link to comment Share on other sites More sharing options...
GringoBandito Posted July 17, 2018 Share Posted July 17, 2018 What happens if you shoot a .401 diameter bullet? Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
ChrisRR Posted July 17, 2018 Author Share Posted July 17, 2018 Same thing (the lead projectiles are sized 0.401"). Generally they are very accurate in other 40 S&W pistols so I'm thinking the bore is suspect. Link to comment Share on other sites More sharing options...
pskys2 Posted July 18, 2018 Share Posted July 18, 2018 Have you checked the muzzle, could need recrowned. Does accuracy change with Lead or Jacketed. I've not had good luck with some barrels and plated bullets. Link to comment Share on other sites More sharing options...
ChrisRR Posted July 18, 2018 Author Share Posted July 18, 2018 17 minutes ago, pskys2 said: Have you checked the muzzle, could need recrowned. Does accuracy change with Lead or Jacketed. I've not had good luck with some barrels and plated bullets. Yeah, that's a thought. Crown does 'look' OK however. The lead was the worst of the lot, the plated projectiles, particularly the lighter ones work a bit better. Having said that I now recall that I've seen no key-holing/tumbling bullets, only clean holes which implies they are spinning up OK. Link to comment Share on other sites More sharing options...
schaet Posted July 18, 2018 Share Posted July 18, 2018 How is the barrel fit in respects to the slide at the business end? Any movement? I know you said it locks up nicely, but if there's movement up front there it could be a factor. Also, what is the twist of the barrel? 1x16 is pretty much the standard, however I shoot a 1x24 that likes a longer bullet better. The barrel could be a red herring here too. Are your sights tight? I shot a match where my rear sight had slight play in it and threw everything off. Didn't realize it until I broke down the gun and inspected it. Link to comment Share on other sites More sharing options...
rishii Posted July 18, 2018 Share Posted July 18, 2018 Have you tried factory ammo thru it on both coated and plated bullets you have to be careful with the crimp, to much and you could cut the plating/coating which would cause accuracy issues, also are you running a FCD which might stage the bullets undersized Link to comment Share on other sites More sharing options...
arkadi Posted July 18, 2018 Share Posted July 18, 2018 I'd try to shoot max OAL possible for that gun too see what happens. Link to comment Share on other sites More sharing options...
ChrisRR Posted July 18, 2018 Author Share Posted July 18, 2018 7 hours ago, schaet said: How is the barrel fit in respects to the slide at the business end? Any movement? I know you said it locks up nicely, but if there's movement up front there it could be a factor. Also, what is the twist of the barrel? 1x16 is pretty much the standard, however I shoot a 1x24 that likes a longer bullet better. The barrel could be a red herring here too. Are your sights tight? I shot a match where my rear sight had slight play in it and threw everything off. Didn't realize it until I broke down the gun and inspected it. Well, its tight at the muzzle no doubt, I can't find any movement there. The twist rate is 1:16 I believe, pretty standard... Link to comment Share on other sites More sharing options...
ChrisRR Posted July 18, 2018 Author Share Posted July 18, 2018 3 hours ago, rishii said: Have you tried factory ammo thru it on both coated and plated bullets you have to be careful with the crimp, to much and you could cut the plating/coating which would cause accuracy issues, also are you running a FCD which might stage the bullets undersized No FCD but I haven't tried factory either. At $1/round here its not something I'm rich enough for......but decent projectiles should be fine I would think, they are in my other 40 cal pistols. Link to comment Share on other sites More sharing options...
ChrisRR Posted July 18, 2018 Author Share Posted July 18, 2018 1 hour ago, arkadi said: I'd try to shoot max OAL possible for that gun too see what happens. Yeah, that could be worth a go. I'll try that this weekend thanks. Link to comment Share on other sites More sharing options...
GringoBandito Posted July 18, 2018 Share Posted July 18, 2018 You could always send it to Bobby at freedom gunworks and have him tune it up for you. I had him install a kkm barrel in mine along with slide lightening. Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
hiker88 Posted July 19, 2018 Share Posted July 19, 2018 25 minutes ago, GringoBandito said: You could always send it to Bobby at freedom gunworks and have him tune it up for you. I had him install a kkm barrel in mine along with slide lightening. Sent from my Pixel 2 XL using Tapatalk Would you mind saying how much a "tune-up" like yours costs? I do have a close to stock Edge that might be a good candidate for a make over. Link to comment Share on other sites More sharing options...
GringoBandito Posted July 19, 2018 Share Posted July 19, 2018 About $1350 but I had him build me a new gun (with original slide) and chose the most expensive coating option You can get a tune up and with a new barrel, slide lightening and re coat for less. Call Bobby. He is great at discussing options over the phone. Btw I got this gun last Wednesday and ran 700 rounds through it and it runs perfect and is extremely accurate. Sent from my Pixel 2 XL using Tapatalk Link to comment Share on other sites More sharing options...
72stick Posted July 20, 2018 Share Posted July 20, 2018 (edited) Look at your slide stop. The pin supports the lower lug and the pin can wear down over time. A new slide stop tightens up the barrel to slide lockup and improves accuracy. Edited July 20, 2018 by 72stick improves Link to comment Share on other sites More sharing options...
ChrisRR Posted July 20, 2018 Author Share Posted July 20, 2018 Ah, yes that's an inexpensive thing to try. I'll try that too. Link to comment Share on other sites More sharing options...
chuckstur Posted July 21, 2018 Share Posted July 21, 2018 PM Sent Link to comment Share on other sites More sharing options...
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