Looking to identify(Old Bullets, Casing, ArrowTip)

All found in Hamilton, Ontario, Canada — Rosedale Area/Lower East End

First – I think it’s a very old rifle bullet casing.. not magnetic.. very heavy.. weighing a whopping 1 pound, 5 ounces.. May have an engraving but it’s hard to make out, can almost see the letters “CPN” but I’m not positive.
Height: 5.5 CM

Second – Weighs 12 Grams

Third – Weighs 10 Grams

Fourth – Possible Arrow Tip.. Early 1900’s? Weighs 3 Grams (Wood still inside).