But what makes the difference?
Consistency, period end of story. For most of my shooting life, I felt like most that I didn't have the time or tools or inclination to make my own ammo. So happily in ignorance I just keep shooting store bought ammo while thinking all along that I needed more and more practice to get better.
Well the WHOLE truth of the matter is that commercial ammo (while getting better) is crap. Unless you buy the very high priced ammo, the quality control on commercial ammo is just not there. Making millions of rounds to meet demand just does not lend itself to quality ammo.
We all use the same brass cases, primers and bullets, but it is the type of powder and quantity of powder in each case that makes BIG differences in how it shoots. The single most important step is to insure that the amount of powder and type is ABSOLUTELY the same for each round fired.
That is the ONLY way to get consistency that the bullets will go where you aim them.
Long story short, in 2004 I started reloading and haven't purchased a commercial round since then and now reload for 13 different calibers.