Home Forums Reloading Varmint Rifles bulk .223 Fiocchi ammo ?

I learned something about bulk Fiocchi ammo this last week,
I purchased a 200 round ammo box of Fiocchi .223 50 gr V-Max like I always use because I get .50 groups with it in my CZ 527 but this is the first time I ever purchased it in the 200 round ammo box, it was cheaper.
when shooting it I saw I was not getting the tight grouping that I in joyed in the past, and when I got back home I compared the ammo to the non bulk ammo that I had at home and saw a difference in the casings,the bulk ammo casings looked like they were heat treated at the neck of the cartridge,is this from reforming the case from production? or production reloads ? now this is all new ammo that I'm looking at and with the same # number 223HVA50 ?