I started at 15, shot IBS Hunter Class Competition. I worked for a commercial reloader that took me under his wings.
I first loaded for a 6MM Vamint with a Lee "Nut Cracker" hand loader, no scales, no full length sizer. My house would not hold the crows, dogs, cats, turtles, that I shot with that varmint rifle.
When I rebarreled the rifle, you could drop a bullet down the barrel 3"...it still shot 1" groups.