one possible cause is the magazine. make sure the lips (on top, each side) has slight bend inward. second, take a piece of cloth with oil and push it down into the magazine well which tend to oil and clean both sides of the inner part of the magazine. see if better feeding........................
Assuming you mean a Sterling mdl 287 PPL in cal. .380, these retailed new for about $90.
Best left to a gunsmith
Make, model, condition. We need all 3 factors.
You can only use .380 ACP ammo in a .380 pistol. Period.
A double action pistol that chambers a .380 ACP round. AKA 9mm Kurz
Small pistol small pistol primer
We need the model- there is more than 1 Browning .380 pistol.
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.
Same round, different name