Bullet hit detection help

Help and Feedback Scripting Support
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#1

I have a script that fires a bullet.(surprising) Only problem is its inconsistent and doesn’t detect hits against parts, and i have no idea why.

function cast (Start, endposition, velocity, original)
	local Bullet = RS.Debris.Bullet:Clone()
	local bv = Instance.new("BodyVelocity")
	bv.Velocity = velocity
	bv.Parent = Bullet
	Bullet.Parent = game.Workspace
	Bullet.Position = Start
	Bullet.CanQuery = false
	Bullet.CFrame = CFrame.new(Start, endposition) * CFrame.Angles(0,math.rad(90),0)
	Shoot:FireServer(Start,endposition,velocity)
	local BulletImpactLoop = nil
	BulletImpactLoop = RunService.RenderStepped:Connect(function()
		local hitcheck = game.Workspace:Raycast(Bullet.Position+-Bullet.CFrame.LookVector*2,Bullet.CFrame.LookVector*5)
		if hitcheck then
			if hitcheck.Instance.Parent:FindFirstChild("Humanoid") then
				if original then
					print("Server, blow him to smithereens, NOW!!!")
					Hit:FireServer(hitcheck.Instance.Parent)
				else
					print("you cant damage the player with a bullet that isnt yours player silly~ Stop.")
				end
			end
			Bullet:Destroy()
			BulletImpactLoop:Disconnect()
			print("Hit. Stop now.")
		end
	end)
	game:GetService("Debris"):AddItem(Bullet,4)
	task.spawn(function()task.wait(4)BulletImpactLoop:Disconnect()end)
end

And then a video:


Does anyone have a better way to do this reliably and consistently, or just another way entirely?
Any help would be appreciated, thank you.