HSThompson, Wobbly is correct. You have not been perfectly forthcoming with info. And it's impeding our ability to assist you. A highly relevant example is that 1SOW asked you
What specific commercial ammo causes the the problem? You responded:
Winchester, Federal, Hornady, etc..
Here's the problem -- none of those are specific. Winchester and Federal have 15-20 types of 9mm ammo, with 3-6 at any given bullet weight. There's a reason that that is a relevant omission.
One of the problems we run into here in this AMMO subforum helping people troubleshoot their problems is that people looking for help will often decide ahead of time what the root problem is, then in looking for the solution, they shade all the data they give us toward the root problem they've already decided upon, which very often isn't the root problem at all. That IS the case here, and here's why:
Bullet weight does NOT affect double feeds and stove pipes. It's preposterous. Some unfortunate stacking of geometric variables between bullet profile, magazine, and feed ramp might cause two live rounds to feed from a mag, but NONE of those are tied to bullet weight. Magazine problems can be a cause, but that's not tied to bullet weight. Insufficient recoil energy as it relates to slide speed or too strong of a recoil spring might lead to stove-pipes with a live round trying to feed simultaneously, but that's not tied directly to bullet weight either, and if it were, since velocity is the dominant variable in kinetic energy, lighter, faster bullets usually produce more energy within a given product line than the heaviest bullets, not less. Recoil energy is the reciprocal of muzzle energy, mitigated by pistol weight and recoil spring. As long as you're talking about the same pistol, you can look at muzzle energy as a relative reference for recoil energy, and 115gr bullets simply aren't behind in energy. They're often ahead of 124gr, and if not ahead, VERY close, and always ahead of 147gr. Here are some examples with specific cartridge, velocity, and muzzle energy:
Winchester White Box
115gr FMJ -- 1190 feet/sec -- 362 ft-lbs
115gr JHP -- 1225 feet/sec -- 383 ft-lbs
124gr NATO -- 1140 feet/sec -- 358 ft-lbs
124gr WinClean Target -- 1130 feet/sec -- 352 ft-lbs
147gr JHP -- 990 feet/sec -- 320 ft-lbs
I threw in the 124gr NATO for a more powerful 124gr round, and the 124gr Winclean Target for a standard. The site I used did not have WWB 124gr standard. Regardless, 115gr will produce more recoil energy than even the 124gr NATO, which in turn produces more energy than their 147gr.
Federal American Eagle
115gr FMJ -- 1160 feet/sec -- 344 ft-lbs
124gr FMJ -- 1120 feet/sec -- 345 ft-lbs
147gr FMJ -- 1000 feet/sec -- 301 ft-lbs
Here, the 115gr and 124gr are 1 ft-lb different. And the 147gr bullet is well behind in energy.
Speer Gold Dot
115gr GDHP -- 1200 feet/sec -- 355 ft-lbs
124gr GDHP -- 1150 feet/sec -- 364 ft-lbs
147gr GDHP -- 985 feet/sec -- 326 ft-lbs
Here are some defensive loads. The 124gr bullet does produce more energy than the 115gr bullet, but the 115gr bullet is still well ahead of the 147gr. If nothing else, this should show you that the energy that cycles that slide is not tied directly to bullet weight.
So that's all point #1. Or was it #2? Regardless, the root problem you're trying to track down is NOT bullet weight. There's nothing about the weight of the bullet to directly influence feeding.
Next point. You say you've shot about 2500 rounds through the pistol. We know you shot 400 back in March of 2015 when you got the pistol and had this same problem, though you attributed it to a bad magazine. So you've shot about 2000 rounds in the last 29 months, almost two and half years. You have also said:
I ran heavier gr bullets through it that summer with only a few 115gr thrown in. Seemed fine for a while the started happening with both mags with 115gr
Okay, in the last two and half years, you've averaged about 200 rounds per 3 months. Clearly not all of those were 115gr. Clearly you had no problem for a while. We don't know what commercial 115gr ammo you were running when it worked fine. We don't what commercial ammo you were running when it started to mess up. We don't know how many of those 2000 rounds you've shot in the last two and half years were shot before the problem re-appeared. We don't know what percentage of the ammo since the problem re-appeared was 115gr. This is all relevant. We know you ran it for a while without problems. We can assume since it's a two and half year span since last the problem existed, AND you're trying to fix it now, that the problem is recent? Right? I would guess the last outing or two? Or three? I mean, if the problem existed a year ago, why would you just be looking for help now? So I'm GUESSING the problem has sprung up in the last couple of outings, maybe even THE last outing. And since we're spreading 2,000 rounds over 29 months, and we're looking at just the last couple of outings, how many rounds have you shot over the span where the problem re-emerged? 400-500? 700? With as few rounds as you've shot through this pistol overall, it's unlikely that over the span of the more recent problem, that you've shot such a wide variety of ammo that you could reasonably claim it happens with ALL 115gr ammo. It's happened only with 115gr, sure. But not all. It's not likely it's happened with many different specific 115gr ammo models at all.
So let's get some basic info. You have shot about 2000 rounds in the last two and half years since your original problem.
How long ago did the problem appear (or re-appear)?
How many outings have there been since the problem re-appeared?
Realistically, how many rounds have you shot since the problem appeared?
What ammo specifically? And if you don't know specifically, just say so.
If you do know, did it happen more with some than others?
Have you shot that Federal Champion 9mm 115gr FMJ in the ALUMINUM cases? It's a maroon-ish box, and is commonly available at Walmart and other big box stores. Have you had problems with that?
Did you strip your pistol of Cosmoline?
And finally, how much do you shoot? When the problem is "I'm periodically getting stove-pipes," ejection issues, limp-wristing is a possibility. AND grip work is good for everyone.