I set down last night to load my first rounds. Everything went very well until it was time to seat the bullets. It seemed that the bullet seating was tight, and required more pressure than I expected, based on my limited experience reloading with a friend. When the cartridges came out, there was a very fine rim of copper around the case mouth on some of the cartridges, indicating some damage had been done to the bullet itself during seating. I stopped after loading 10 rounds because it just didn't feel right. I am going to pull the bullets tonight to see what's going on the lower part of the bullets.
What am I doing wrong?
I am considering backing away from the .300 rounds until I am more confident in my abilities, perhaps starting at 38 special and working my way up.
Sierra 30 cal spitzer bullets
300 Win Mag
69 grains of H 4831 powder