I got these cool 7.62x51 sabot rounds that use 5.56mm projectiles and figured that this sub would be interested : r/ForgottenWeapons
Sabot (firearms) - Wikipedia
Reloading with Sabots
45 Caliber Sabot Bullets in a .50 Caliber Air Rifle | Pellet Guns 1.com
Green High Pressure Muzzleloader Sabots - Knight Rifles
Sabot Rifle | Hawken Wiki | Fandom
Soviet fin stabilised discarding sabot rife caliber ammo - General Ammunition Collector Discussion - International Ammunition Association Web Forum
The Steyr IWS 2000, a man portable smoothbore bolt action anti-material rifle. It fires a 206mm long armor piercing fin stabilized discarding sabot DU or tungsten projectile at 4,757 feet per second. :
Slug or Straight? | Shoot On
Future Firearms Ammunition Technology 003: Sabots – Performance-Enhancing Shoes for Your Bullets -The Firearm Blog