You didn't specify your loads. Green Dot is too low a pressure powder to bring pressure up to a reasonable level in a ten gauge with a light shot load. Tell us what exactly you are loading, and we will tell you what your problem is. I am not surprised that you have leakage. If your gun is in good shape with good barrel wall thickness, you can't blow it up with Red Dot or Green Dot. Red Dot is my choice, because it is cheap and will keep pressures up in a big barrel. I have also used it for target loads for about fifty years and have a bunch.
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