I have quite a few and never any trouble. I have a 16 that I have shot a lot since I got it in 1973; no problems. One problem may be paper shells as mentioned. Another may be that for most of the last 50 years, the 16 loads available have been 2-3/4" loads trying to keep up with a 12 gauge.
You might check the chambers and forcing cones. If someone opened it up, they may have not controlled the reamer very will and cut the extractor/chamber oversize.
Just wanted to add (this may ruffle feelings here), but i don't think shooting modern loads in an NID is really a safety issue. They are considered by a llot of people to be the strongest of all the classic shotguns. It's just that the combination of stiff 1-1/8 oz loads and a gun with a shorter chamber may be enough to make the hull sticky. My 16 I mentioned was made in 1948, has 2-1/2" chambers (who knows when the barrels of a 1948 gun were made) and I shot it till it burnt your fingers every time I went dove hunting. Before I knew better, I shot the heaviest field loads I could find. When I finally grew up and got some tools, I measured the barrels. I found out they were 2-1/2" and had 0.028 thick barrels in the front half. The gun is as tight as the ay it was made.
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