Let's look at 7.62x51 vs. 7.62x39 with an analysis of ballistic performance, price to shoot and other factors as well as a quick history lesson.
Caliber Comparisons - Page 7 of 7 - Buyers and Ballistics Guides for Shooters
Military Ammo Designations - A Shooter's Guide
Thor technically speedblitzed Hulk without Mjolnir when he was attacking Natasha in the first Avengers movie. Why do people still think Thor is slow in the MCU? - Quora
Supervillains: Who is Hulk's most dangerous adversary? - Quora
Why do people still think speed blitzing the Hulk is the most effective way to defeat him when he has clearly fought friend enemies? - Quora
Why do people still think speed blitzing the Hulk is the most effective way to defeat him when he has clearly fought friend enemies? - Quora
Has the Hulk ever used clever tactics to defeat someone? As opposed to simply using brute strength? - Quora
30-06 Ammo - 20 Rounds of 175 Grain Polymer Tipped by Barnes
Wouldn't it make more sense for AA guns to fire shotgun shells instead of bullets? - Quora
Wouldn't it make more sense for AA guns to fire shotgun shells instead of bullets? - Quora
What kind of caliber bullet do most snipers use? - Quora
Has the Hulk ever used clever tactics to defeat someone? As opposed to simply using brute strength? - Quora