I have a Springfield 1911 that the slide is jammed with a fat round stuck I the chamber. The slide is locked almost closed and won't budge. What's the best way to clear this? Thanks

If it's a live round, take it to a certified gun smith (call first so he's not surprised).
That's not something to be taken lightly or messed with.

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Hold my beer and watch this!

Whats a "fat round"?

Do you have a rubber mallet? Rap it in cloth and try gently smacking the slide on an angle. Try hitting it harder but dont go beating it senseless
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Place the lower front of the slide (below the barrel) against a solid surface. Being very careful of where the muzzle is pointed in case of an accident, hold the gun firmly (finger off the trigger) and PUSH! Sometimes you may have to smack the back of your shooting hand with the off hand to break it free.
Over many years I've had this problem a few times and this method works for me. If it doesn't, its time to see the gunsmith.

I have found with my Springfield Range Officer that cast bullets had not be any bigger than .452 or I will have that problem also. it has a much tighter chamber than the Kimber Compact sst and the S & W 1911 that I use to have

I had this happen when one of my subgun reloads got mixed into my pistol reloads. Open bolt subguns bulge the heck out the brass and when reloaded will lock up my 1911s. Lesson learned the hard way - so I have some experience with these.

Clearing these is a risky proposition, so be careful. Don't try to force the round in, it will never happen and just get worse.

Grayfox has it right (i prefer a solid outside stair case or ledge where the muzzle points at the lawn) and when you do this, one of three things will happen. It will clear, it will rip the rim off the case, or you'll break the extractor. If either of the last two occur, get a wooden dowel small enough to fit a 9mm case over, disassemble the gun, get the barrel into a vice, then make sure nothing is on either end of the barrel, insert dowel with case over the end (so the dowel doesn't split and wedge between rifling and bullet) stand aside and hammer it out.

Where did you get the ammo? You have to be careful reloading range brass, or buying ammo from people reloading range brass. Dillon dies won't resize the entire case, leaving bulges from unsupported chambers in place, and then you end up with a situation like yours.

If you get it unstuck and the barrel is bad, call Springfield. Lifetime warranty and out standing customer service.

The second poster asked if it was a live round. If it is I would not try to pound it out. If it has been fired out you could use a squib rod or a drop rod to remove the brass. As a last resort I would try to support the barrel bushing between the barrel and guide rod with a stiff wood shim and try to force the slide back by pushing the grip frame forward against the shim and something solid. Be careful to not scratch anything. You can also slip a doll rod down the barrel to determine the depth of the obstruction, and rule out a stuck bullet. Or determine that the brass is empty.

It's a live round In a Springfield loaded target 9mm 1911.

I would remove the firing pin first.

Got it out. Struck the slide with a lead babbit and rubber mallet, that didn't work. Did the surface thing that didn't work. Unscrewed the guide rod, spring and took the bushing off and did the babbit and rubber mallet thing, slide opened up. No squib, just a fat reload. It's my buddy's gun. I was shooting it and got slide not going into battery but got it unstuck. Took the same round, loaded it manually and let the slide drop. Memo to self, don't do that again! Thanks to all for the input.

Is the slide all the way forward? Can you force the slide forward, and fire the round? I could tell you several ways, but after typing a couple of paragraphs I realized how dangerous it would be. We these reloads? Do you have any idea how the round got "fat". Bulged brass would be safe to fire if you can force it into battery, but a deep seated bullet could go way over pressure and damage the gun.

It was a reload. Buddy said he manualy checked these rounds in a Springfield xdm barrel. The round would only go about 3/4 the way into the 1911 Springfield.

When you say "loaded it manually", did you put it under the extractor or drop it into the chamber? I think for the last post you popped it under the extractor.

Good point by LV Steve. The 1911 uses a controled feed system. As the round come up out of the mag, the rim slides under the extractor from below. Dropping the slide on a chambered round can damage the extractor.

I dropped it in the chamber and dropped the slide.

But it jammed the first time when it came out of a mag.