I've been shooting light (1 1/12 oz)steel reloads in Nitro Specials since 1985 and have had no bore problems. I have had some stock cracks and rib loosenings, but likely would have had them regardless what loads were used, as these guns are old oil-soaked klunkers. Just make sure you use good shotcups and stay away from small size shot. Smallest I use is #3 because all I hunt is waterfowl and a few grouse and pheasants.