“If I shoot ammo (full metal jacket) at the range from a reputable reloader, am I being safe?”
There are no guarantees in life.
Malfunctions have and will continue periodically with any ammo whether factory or reload.
Wear eye and ear protection and handle firearms safely.
Two years ago I had a barrel blow completely off my 9mm AR-type carbine at the range due to my use of factory aluminum cased ammo, which I soon found out through actually reading the manual, (Duh!), that aluminum cased ammo was not approved for such a blow-back carbine.
My spouse was shooting next to me and asked:
“Is that supposed to that....?
Other than my shorts being somewhat stained, no injury occurred.
I had to ask for a a cease fire on the line and recovered my barrel that was now twenty feet in front of me on the ground.