Sphere Trace or Collision Shpere: Which one is better for high speed projectile?

Hi,how’s it going.
so what you did is first do a sphere trace,if hit then it’s done,if not hit then do a extra line trace?
I’m not sure if I understand the middle part. you store the hit result as a variable?
I recently met a similar problem.the sphere trace is not reliable when speed is over 3000.