Would it be possible to create a firearm capable of firing 2 different calibre bullets from the same barrel? Example 5.56 and a 7.62, could the smaller cartridge be cased similar to
![20X112MM WHITE SABOT TITANIUM FLECHETTE NO HEADSTAMP – CollectibleAmmunition.com – Your source for Collectible Ammunition 20X112MM WHITE SABOT TITANIUM FLECHETTE NO HEADSTAMP – CollectibleAmmunition.com – Your source for Collectible Ammunition](https://i0.wp.com/collectibleammunition.com/wp-content/uploads/2023/07/IMG_6146.jpg?fit=1920%2C1280&ssl=1)
20X112MM WHITE SABOT TITANIUM FLECHETTE NO HEADSTAMP – CollectibleAmmunition.com – Your source for Collectible Ammunition
![Future Firearms Ammunition Technology 003: Sabots – Performance-Enhancing Shoes for Your Bullets -The Firearm Blog Future Firearms Ammunition Technology 003: Sabots – Performance-Enhancing Shoes for Your Bullets -The Firearm Blog](https://www.thefirearmblog.com/blog/wp-content/uploads/2016/08/0824160054b2.jpg)
Future Firearms Ammunition Technology 003: Sabots – Performance-Enhancing Shoes for Your Bullets -The Firearm Blog
![5.6X44MM XM 216 GREEN SABOT FLECHETTE RA 65 – CollectibleAmmunition.com – Your source for Collectible Ammunition 5.6X44MM XM 216 GREEN SABOT FLECHETTE RA 65 – CollectibleAmmunition.com – Your source for Collectible Ammunition](https://i0.wp.com/collectibleammunition.com/wp-content/uploads/2022/08/IMG_1712.jpg?fit=1920%2C1280&ssl=1)