What is slow to you?
I think in a hunting context impact velocity is a lot more of a factor than muzzle velocity. I will presume the OP is referring to impact velocity.
With that in mind, I consider ~1800fps to be slow. Below this threshold few bullets will expand reliably. As a result terminal performance can be poor when using a small bore at low velocity. There are some very slow and effective cartridges, but they tend to push BIG, HEAVY bullets.
What is slow to you?
I was thinking about impact speed but consider the 223 for example. It's a high muzzle speed round, the bullet starts off at 3000 fps but at 300 meters bullet speed is down to 1800 fps.




























