Ruger Sr40c feeding issue

If the round has been properly fed from the magazine it should be FULLY under the extractor and positioned held against the breechface as the slide goes forward. If the slide is moving forward and the round isn't YET under the extractor, something is wrong. The first thing that comes to mind is that the mag spring has weakened, and isn't pushing the round up far enough or fast enough to be properly positioned for the rest of the feed process. If that's the case, the bottom of the breechface would catch the top of the round's rim as the slide moves forward and that could cause the problem you describe...
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Walt I think i have it diagnosed already. The mag is brand new and the reason it is hanging up is because the mag spring is so stiff on it. The recoil spring is also pretty weak coming from ruger @ 16 lbs. With those two factors in the same equation it doesnt have enough velocity to strip that first round out. Galloways 18lb recoil spring is on the way to fix the problem.

Weakened mag springs usually cause the last rounds in a mag to cause problems. In this instance, it's the first couple of rounds in a fully loaded mag doing it.
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G. Wilikers has got it.
 
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Let us know the outcome after changing recoil springs.
I tried out a SR9C and found the mag springs so stiff that it was impossible to load them up all the way without pain.
The mag loading tool that Ruger supplies was missing.
So, I didn't, only filling them up about ten rounds worth.
And the gun ran fine that way.
 
A REALLY stiff mag spring and a weak recoil spring can cause problems, but those problems don't always show themselves in the ways you described (i.e., a round that's tilted up and not chambering.) More often it's a failure to go fully into battery -- because the recoil spring (if weak) doesn't have the power to strip the round crisply or power the slide closed.

It would be nice to know if it continues to be a problem with the mag downloaded several rounds... (as g.willikers saw with his gun.)

You'll know shortly if your (joint) diagnosis is correct, and it won't be the first time I've been surprised in one of these diagnostic discussions.

IF the mag spring is very stiff, just leaving the mag loaded for a week or two might cause the spring to relax enough that it won't be a continuing problem.

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Update on the gun,

Got the 20lb guide rod and spring from galloway. Fixed the issue. Can now load up a full mag and it chambers that first round now. The mag spring is so rediculous round 12-15 is painful to get in by hand. the mag loader is a must.
 
Gotta Polish the feed ramp... most of my Rugers had sharp edges and manufacture marks on them. Found the wifes finger nail buffer works great. Its a foam padded contraption that has 7 different smoothness buffing areas. The last three are almost like a fine leather. It works great. Also try a product like seal1, it actually penetrates the metal and seals it and lubes the gun, no oil needed and out cleans the others from black powder to edged weapons
 
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