New challenge!!!! shell casing type???

Ok folks, I have a challenge for you. What is this shell casing? A Friend of mine gave them to me. He got them (about 150) from his grandfather

Shell Game by Sara Paretsky, Paperback

Shell (projectile) - Wikipedia

2022 New Ns Switch OLED Game Card Storage Box Hard Shell

Shell Casing Ring • TTWL – Legendary Ring

44ct Challenge Coin Display Personalized 9mm Bullet Casings Wall Mounted Military Navy Air Force Army Police

PowerA Folio Case for Nintendo Switch, Folio-Style Shell Case

Game Console Replacement Full Set Blue Huosing Shell For New 3ds

New challenge!!!! shell casing type??? The International Association of Penturners

A-Frame®, Dangerous Game Heavy Rifle Ammunition

How to Read a Box of Shotshells