Q) Are not all 7.62 ammo the same and interchangeable?
A) NO all 7.62 Ammo (ammunition) is not the same and is not interchangeable, Absolutely not.
Make sure you purchase and use only the ammo designated for your particular weapon.
Here is somewhat of a 7,62 ammo guide to get you started. When in doubt ask a gun dealer specifically what to shoot in your weapon.
7.62 ammo is used in Pistols, Revolvers, Sniper Rifles, Assault Rifles, and Machine Guns.
List of 7.62 Ammo by typical use for Rifles and Machine Guns:
7.62x39mm … also known as (a.k.a.) 7,62 Soviet, M43, or Combloc. This ammo size is designed and used in the SKS, AK47, AKM Assault Rifle, RPD and RPK Light Machine Guns.
7.62x51mm NATO …. This includes it's civilian variant the .308 Winchester. This is used in the M14 Rifle and M60 Machine Gun.
Do NOT confuse this with the 7,62x54mmR Soviet Rifle Cartridge.
7.62x54mmR …. This is a Russian Rifle Cartridge used in the Mosin-Nagant.
.300 Winchester Magnum …. is sometimes called the 7,62x67mm
.300 Lapua Magnum …. is sometimes called the 7,62x70mm
List of 7.62 Ammo by typical use for Pistols:
7.62x25mm Tokarev …. also known as (a.k.a.) 7,62 TT, this was used in the Tokarev Pistol during WW2 and many of the submachine guns.
List of 7.62 Ammo by typical use for Revolvers: