At least not in Traditional guns. Maybe for a centerfire or even modern saboted bullets, but the mantra speed kills isn't the whole story in sidelocks. I prefer energy over speed
Here's why I say that:
TC maxi ball , maxi hunter or other conicals average about 1400 fps leaving the muzzle at over 1600 -1700 fp energy with a 100 gr load and in a 50 cal. Slow but devastating
On the other hand a round ball leaves the muzzle at over 2000 fps, quite a bit faster but not near as heavy therefore much less energy.
Hence faster isn't always better. Of course a round ball will do the job within its given range but that not the point. The point is the mantra that is so popular "speed kills" as if faster is always better isn't always the case