I have had some real problems with cases from Kynamco (Bertram brass) They are 0.005 mm thinner then my WR cases made by D Horneber.
They will not hod the bulet tight and canb therefor not be used.
The Horneber cases are quite ok and I will use only them i the future.
I also make my own bullets, it is great fun.
I trimm with fine sanding paper if they need a little trim.

Cheers,

André