Alpha Brass vs ADG and Lapua

I tried some alpha brass and I have had some problems with alpha brass for a 6xc not having consistent case rim thickness. About 10% of them won't even fit in the shell holder to install a primer. I have a whole unopened 100 round box I will try to return. Probably will be trying peterson or lapua.
 
I tried some alpha brass and I have had some problems with alpha brass for a 6xc not having consistent case rim thickness. About 10% of them won't even fit in the shell holder to install a primer. I have a whole unopened 100 round box I will try to return. Probably will be trying peterson or lapua.
Peterson brass in my 6 xc had been excellent.
 
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