why

A question I have is in regards to types of bullets. I have read and heard that there are basically 3 types of bullets. Secant, tangent, and hybrid ogives. Which is better/ preferred? Why? I've heard of trimming the outside of the case neck, not sure why people do it though.

Let me preface this post by saying this: I have an AKM pattern rifle chambered in 7.62x39. I understand that 300 Blackout is easier to reload and easier to suppress. And while I do reload, I do not have a suppressor (yet. Someday...). I've been thinking about getting a 300 Blackout upper for...