Thread: how little reworking of the brass while reloading is necessary

I have a friend who basically dosent resize brass when reloading and has really good results which is making me think I might try his approach

he basically knocks the primer out and replaces it without resizing the neck and fills it with the powder charge, seats the bullet and crimps
using it in the rifle it was fireformed he has no tight bolt on loading which surprises me

what potential issues can arise with this approach if loaded bullets are only used in the chamber they formed in?