Primers Flattening in the pocket.

[youssefa]

I was originally shooting 220's /7.5gr unique . about 1079-1050. bullet in the rifling. so I went to 7.6 gr unique and made 10 rnd batches seating progressivly deeper, this is when the primers started acting like that!

[HUNTER2]

+ 1 on excessive pres. With Nato primers flattening out you are knocking on pierced primers door! Question - Was the 7.5 into the lands not accurate enough the reason you started changing? My TC loves them loaded as far out as they will go...Just wondering......