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Whoa-hoa, there- don't go grinding on that chamber in such a great big ol' hurry. If there were no chamber issues before and you go inflicting concentric scratches with coarse steel wool at the mouth of the chamber, you may HAVE some real chamber issues when you get done.
First of all, what grade steel wool do you have? It better be 0000, if you are going to use it for anything beside stripping furniture. Otherwise it is apt to be scratch city. If you want to polish the chamber mouth, something a lot more gentle and less abrasive is in order- some metal polishing compound like Simichrome on a soft cloth for example.
Have you given the gun a thorough cleaning yet? Remington coats new guns with a preservative that can be very sticky- gotta get it out of the works or it can gum things up. A new bore brush and some good solvent is a first step key to getting the chamber scrubbed out, and if you can find a new 10 ga. brush or a specific chamber brush so much the better. But brush and solvent FIRST.
Lots of times this particular problem IS ammo specific. Solution: don't use that ammo. Sorry to hear you bought a stack of it, lesson learned should be to try new ammo first in a new gun, to see if the gun likes it- before you buy a bunch of it. I doubt any store will allow you to return ammo, I could be wrong there. If they won't take it back, maybe you can shoot it in something else if you have another gun of the same gauge, or perhaps you can trade it off/sell it to friends.
Examine the heads of some fired hulls- any scratches in them, running from the rim of the shell toward the end of the base? Take off the barrel, and feel around the breech edge of the chamber, pulling your fingertip from the inside toward the outside. Feel any burrs or roughness anywhere around the perimeter of the chamber? If so then gently removing them with a fine Swiss file is in order- key word being GENTLY. I am not talking about grabbing a Chinese milling machine (a bastard file) and whaling away- nothing that does more harm than good, please.
Chances are good that a good cleaning and an ammo change will fix your problem. Chances are that if it DOESN'T, some professional attention is in order.
Good luck with it, stay safe-
lpl/nc
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