OK,
Here are a few that you don’t see that often.
Some more common cartridges shown for size reference.
Left to Right
.50 Caliber BMG (Factory dummy cartridge)
.50 Caliber Spotter (I was informed that this was for a .50 caliber Spotting Rifle mounted on the 106mm Recoiless Rifle. Though I have no way to verify this)
.30-’06 Springfield (Home made dummy cartridge for function checking firearms)
3” 12 gauge magnum
1 ¾” Aguila 12 gauge Mini Shell
223 Remington / 5.56mm, Yup it is a brass case head with a polymer case body. Here is some info about it:
http://www.defensereview.com/modules.php?name=News&file=article&sid=820
And here’s something I found posted elsewhere.
50 BMG back row left to right: Mk211 Raufoss Multipurpose Round, SPOTTER round, "Silver tip" Armor Piercing Incendiary, "Blue tip" Incendiary, "Black tip" Armor Piercing, "SLAP-T" Tracer SLAP, "SLAP", "Red tip" Tracer, Ball.
.223 front row left to right: "Green tip" Ball, "Red tip" Tracer, "Blue tip" Incendiary, "Black tip" Armor Piercing, .500 S&W Magnum.