Ammo - Store Bought, or Hand Load?

A friend of my dad's reloaded 308 rounds but they'd stick in the chamber. Max Chatfield though, was a crack marksman abd made hus own bullets and loaded his own rounds for better quality control but never sold a round to anyone else. Poor guy was deaf as a post.

What was stuck? The brass after firing the round? You can monitor and adjust your own performance across several variables by loading your own rounds. Seems like there would be a deeper connection with the process that way.