Mousehit is Sort of "UNACURATE!? help me!?

I have this little fire ball script with the use of mousehit and the position of the mouse

but when I push f the fire ball shoots "near" the mouse position but not on it! (its not accurate)

game.Workspace.firedfire.OnServerEvent:Connect(function(player, suse, mousehit)
	local mouse = player:GetMouse()
	local hithum = false
	local char = player.Character or player.CharacterAdded:wait()
	local hum = char.Humanoid
	local alrt = false
	suse = true
	--char.HumanoidRootPart.CFrame = CFrame.new(char.HumanoidRootPart.Position,char.HumanoidRootPart.Position + mousehit.lookVector)
	local iceb = game.ReplicatedStorage.fireball:Clone()
	iceb.Parent = char
	iceb.CFrame = char.HumanoidRootPart.CFrame*CFrame.new(0,3,-10)
	local bv = Instance.new("BodyVelocity")
	bv.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
	bv.Velocity = mousehit.lookVector*70--.HumanoidRootPart.CFrame.lookVector*70
	bv.Parent = iceb
	
	iceb.Touched:Connect(function(hit)
		if hit and hit.Parent:FindFirstChild("Humanoid") and hithum == false then
			hithum = true
			
			iceb.BodyVelocity:Destroy()
			iceb.Anchored = true
			
			hit.Parent.Humanoid:TakeDamage(15)
			local fire = Instance.new("Fire")
			fire.Size = 8
				fire.Parent = hit.Parent.HumanoidRootPart	
				for i = 1,5 do
					wait()
					iceb.Size = iceb.Size + Vector3.new(1,1,1)
				end
				wait(.5)
				iceb:Destroy()
			for i = 1,10 do
				wait(.5)
				hit.Parent.Humanoid:TakeDamage(2)
			end
			fire:Destroy()	

		end
		
--	fir:Destroy()
end)
		
	
wait(2)
	suse = false
	
		end)

How do I make the fire ball shoot "Accurately AT The Mouse"!?

See if this is accurate and then you can edit your script accordingly. As incapaz said, this is client side for accuracy, this doesnt address the client/server issue.

local mouse = game.Players.LocalPlayer:GetMouse()
x.CFrame = Character.Torso.CFrame*CFrame.new(1, 1, -3)
    local y = Instance.new("BodyVelocity")
    y.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
    y.Velocity = (x.Position - mouse.Hit.p).Unit * -175