Dear Guys,
My first rifle was a 7 Mag, and then I got a reloading set for Christmas.
I wanted to shoot a light load, for practice and varmints, so I got a Speer reloading manual, selected the lightest load listed in the manual for a 145 grain bullet, and carefully reloaded about 40 rounds.
At the range, when I fired each shell, it was really hard to open the bolt, chards of brass kept getting scraped off when I ejected the rounds, and the primers were dimpled outward. Since I had never reloaded before, I thought that I had just re-sized the brass shells incorrectly. I had no idea that these were all signs of dangerously high pressure.
So, I just continued to fire each shell, until at about round number 20, my extractor broke off. It was a miserably hot and humid day, sweat was pouring down my face into my eyes, my shoulder was bruised, and my rifle was broken. I was so PO-ed by the experience that I gave away my reloading equipment and never reloaded again.
It wasn't until years later that I learned that light loads can create dangerously high pressure (from too much oxygen), and that reloading manuals are just general guides that can be WRONG. At the first sign of high pressure, I should have destroyed the remaining rounds, and then gone upward in the chart to add a little more powder to my reloads.
To this day, I am a factory load only guy.
Best Regards,
Mannyrock