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Like J357 said, the diameters are the same. But the weight will be lighter in 380. The problem you run into with heavier bullets is that they are longer than lighter bullets. The inside of the case tapers(metal gets thicker) the further down into the case you go. If you try to seat a heavy bullet into a 380 case, it will bulge out the case at the bottom end of the bullet. I have made some reloads using 122 grain "9mm" bullets, and they worked, but I did get a small amount of bulge. I have since moved to 90 grain bullets, and those work much better.
What weight are the bullets you have?
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