Projectile stays still?

I have been scripting a gun, and while doing so, after making the CFrame of the bullet slightly away from the weapon (to ensure no damage is taken to the player, and for effect), but doing so makes the bullet freeze. I have no idea on how to fix this, but I have isolated the area I think makes it do that. There is also no errors in the output, and the code after it works fine. (In a localscript)

print 'all is good'

local t = script.Parent
local h = t.Handle
local MaxAmmo = script.MaxAmmo
local Ammo = script.Ammo
local AmmoPerClip = script.AmmoPerClip
local s = t.Sight
local running = false
local aiming = false
local AmIEquipped = false

t.Equipped:connect(function()
	AmIEquipped = true
	local plr = game.Players:FindFirstChild(t.Parent.Name)
    local m = plr:GetMouse()
    m.Button1Down:connect(function() --shoot function
	    if MaxAmmo.Value == 0 then
		    print 'no ammo'
        else
	        Ammo.Value = Ammo.Value - 1
	        if Ammo == 0 then
		        print 'reloading'
		        local emag = Instance.new("Part", Workspace)
		        emag.FormFactor = "Custom"
		        emag.Size = Vector3.new(0.5, 0.8, 0.48)
		        emag.Position = h.Position - Vector3.new(0, 1.5, 0)
		        MaxAmmo = MaxAmmo - AmmoPerClip
		        Ammo = AmmoPerClip
		        wait(10)
		        emag:remove()
	        end
	        local b = Instance.new("Part", Workspace)
	        b.Name = "Bullet"
	        b.BrickColor = BrickColor.new("New Yeller")
	        b.FormFactor = "Custom"
	        b.Size = Vector3.new(0.05, 0.05, 1.3)
                b.CFrame = h.CFrame * CFrame.new(0, 0, -3) --problem line
	        local v = Instance.new("BodyVelocity", b)
	        v.maxForce = Vector3.new(math.huge, math.huge, math.huge)
	        v.velocity = m.Hit.p*50
	        b.Anchored = false
	        local deb1 = false
	        b.Touched:connect(function(hit)
		        if not deb then
			        deb = true
		            if hit.Parent:IsA("Model") and hit.Parent:FindFirstChild("Humanoid") then
			            human = hit.Parent:FindFirstChild("Humanoid")
			            if hit.Name == "Head" then
				            human.Health = human.Health - 20
				            print '20'
			            elseif hit.Name == "Torso" then
				            human.Health = human.Health - 15
				            print '15'
			            else
				            human.Health = human.Health - 10
				            print '10'
			            end
			            b:remove()
			            if human.Health == 0 then
				            print 'the human has died'
			            end
		            else
			            print 'an inanimate object got shot! poor thing ;c'
		            end
		        end
	        end)
	    end
    end)
    m.KeyDown:connect(function(key) --run function
	    if key == "q" and running == false then
		    local char = game.Players:FindFirstChild(t.Parent.Name).Character
		    local hum = char.Humanoid
		    hum.WalkSpeed = 32
		    running = true
	    elseif key == "q" and running == true then
		    local char = game.Players:FindFirstChild(t.Parent.Name).Character
		    local hum = char.Humanoid
		    hum.WalkSpeed = 16
		    running = false
	    elseif key == "r" then
		    if MaxAmmo.Value == 0 then
		        print 'no ammo'
            else
		        print 'reloading'
		        local emag = Instance.new("Part", Workspace)
		        emag.FormFactor = "Custom"
		        emag.Size = Vector3.new(0.5, 0.8, 0.48)
		        emag.Position = h.Position - Vector3.new(0, 1.5, 0)
		        MaxAmmo = MaxAmmo - AmmoPerClip
		        Ammo = AmmoPerClip
		        wait(10)
		        emag:remove()
		    end
	    end
    end)
    m.Button2Down:connect(function()
	    local cam = game.Workspace.CurrentCamera
	    if aiming == false and AmIEquipped == true then
		    t.GripPos = Vector3.new(-1, 0, 0)
	        print 'aiming'
	        cam.CameraType = "Attach"
	        cam.CameraSubject = s
	        aiming = true
	    elseif aiming == true then
		    t.GripPos = Vector3.new(0, 0, 0)
		    print 'not aiming anymore'
		    cam.CameraType = "Custom"
		    cam.CameraSubject = plr.Character.Humanoid
		    aiming = false
		end
    end)
end)

t.Unequipped:connect(function()
	AmIEquipped = false
end)

You are only moving the bullet once, while you need it to move constantly. Use a coroutine:

function bM(b)
	while wait(0.01) do
		b.CFrame = h.CFrame * CFrame.new(0, 0, -3)
	end
end
bulletMove = coroutine.wrap(bM);
bulletMove(b); --Call this when you need the bullet to move

Might it be line 41?

Replace line 41 with v.velocity = (m.Hit.p - h.CFrame.p).unit*50 and see if that helps, because the way you had it, the velocity would be the mouse's hit position, instead of the direction to the mouse's hit position.