I did think it may have been the Factory ammo and have sent an email twice now to Hornady on this issue but so far no answer. Maybe I will try A third email.

What puzzle me is we had fired at least 2 packets of factory ammo from the same batch and no problem then half way through the third packet the problem showed up. All 3 packets have lot number 3082057 all 3 packets are Hornady 400gr DGX factory ammo. Once the barrel was cleaned it was ok.

The weather on that day was overcast with temperature around the 25 degree mark all day. If it is factory ammo then I can only conclude it is due to poor quality control not ideal when you should be able to buy this ammo of the shelf and hunt Africa - one of the hottest continents on earth - with it.

All the cases that popped the primers are useless now as the new primer just falls out of the pocket.