I have an AMP and have freely annealed brass for a number of forum members. It isn't an essential part of reloading (don't worry too much if you don't anneal!).
It does however do everything @dannyb and others say and can be thought of as one of the extras a reloader can do to lift the quality of their reloads beyond basic sizing, priming, powder charge, and seating. Sorting brass and projectiles by weight, adjusting concentricity of loaded rounds, cleaning the primer pocket, neck turning, cleaning brass before reloading are all in the same category (some of these stop being optional, eg untrimmed brass will FTL or split).
The fundamental rule of reloading is consistency...as little variation as possible from one round to the next to the 100th later. Annealing is one of many actions the reloader can take to eliminate inconsistency. So, not essential but satisfying for the reloader to know that is one less doubt to have when looking at their groups, and their limited supply of brass!
And I am still happy to anneal for free for members per the terms in that thread some time ago![]()
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