Since you are just getting started into reloading, make sure you followed a load recipe EXACTLY. Use the exact bullet, powder, primer and charge weight listed in the book or from a manufacturer's website. There is not a "huge" difference between 95 and 100 grain bullets, but there IS a difference. You do not just randomly swap components unless you really know what you're doing and what the result will be.
I am also shooting a PK 380 and load for it with 2 different bullets. Send me a PM and I will help you with some load ideas.