If you want down range readings, you have the choice of putting your chrono down range, shielding it and working out how to read it if it is not a forward facing display OR
look at dopler radar such as the FX model ..... around 150 or labradar at about 400 plus .... maybe more.
They track the projectile down range. The labradar likely to be the better but at that price, so it should.
In a battle of wits I refuse to engage with an unarmed person.
To one shot one kill, you need to seek the S. Kill only comes from Skill