1,000 fps is usually the minimum velocity to begin to get reliable expansion. The 380 barely achives this at the muzzle. What you experienced is rather typical of the 380. Since some bullets for the 380 are also loaded in 9mm, the hardness is rated for expansion in the 9mm and it's higher velocity. Another problem as well with making a bullet soft enough to expand well with the 380 is that due to the minimal weight and velocity a 380 round that expands well, may lack enough power to penetrate to vital organs. I have found that a 85-90 swc style bullet gives good penetration, while cutting a nasty wound channel. The problem with those is they don't feed well in all autos due to their short nose. The 380 is right at the threshold of power, with this round penetration to vitals should be the first goal, with expansion if and when you get some. In reality, the ball round is a fair consideration offering both deep penetration, and reliable feeding.