check the extractor. There may be too much tension on it thus racking rounds as they are driven into the barrel. Them things dont go in there cock-eyed.
Remove the extractor and chuck it in a vise. And gently, ever so gently try to take some of the bend out of it. A hammer may be required, but be very careful. If its a SS extractor, you can be a little more forceful with it - SS is painfully springy and takes a fair bit of persuasion to bend (or un bend as the case may be). Go slow.
Oh and as for the dremel - I'd advise against it for this kind of job. The dremel has its place in gun smithing, but its a crude device at best. If you want to polish the feed ramp and barrel ramp (though probably not the issue on a new gun) use a dowel, some oil and emery cloth (for shaping/removing material) or fine sand paper (400-600 is about right for polishing) as described above. Go slow and use easy pressure, you'll be surprised how little goes a long way. You'll kick youself for a long time if you put scratches all over the ramp. As they say, you can take material off - but not put it back on. Bending an extractor takes off no material.