there have been some valuable lessons.
1: don't reload when you're tired.
2: Remember to prime your newly trimmed and chamfered brass BEFORE you add powder and bullets.
3: kinetic hammers are a really useful addition to the loading kit and it was a smart decision to buy one before I needed it.
4: It doesn't matter how carefully you measure things with your shiny new OAL gauge and callipers, or how carefully you seat your bullets so that all the rounds are exactly the ideal length for your precisely measured chamber length, if you haven't measured the inside of your bloody magazine.
You're still a complete numpty when sitting at the shooting bench wondering why your rounds won't fit in the magazine and have to pack everything back up again and take it all back to the workshop to seat the bullets 1.5mm deeper in the cases so they'll actually fit in the mag and chamber when you cycle the action.