![](https://lemmy.world/pictrs/image/cce297d9-19e5-47b7-ada2-203d5780f961.jpeg)
![](https://sh.itjust.works/pictrs/image/bae905b8-0357-4d8f-aeee-8c3227e76c8c.png)
On the heat issue prolonged fire would cause the metal to soften allowing for increased degradation of the rifling.
The easiest ways for it to happen would be either a poorly made barrel or a barrel not designed for a specific projectile. Different barrel twist rates are better for different cartridges. A heavy bullet is better in a faster twisted barrel. If you fired a very heavy bullet in a slow twisted barrel you would likely not have it reach a proper stabilization.
The bullet is heavy. The pressure wants out it’s easier to breach a little bit of brass than to move a heavy bullet. The greatest risk here is the fragmentation of the brass casing.