Yesterday evening I sat and de-capped a couple of hundred once fired .243 cases I had been given.
91 Federal and 102 Nosler, they have been cleaned so I looked the outside over for damage and then just popped the primers out.
A few cases would not fit in the shell holder so I put them to one side, once all that fitted were done I looked the odd ones over more closely.
15 were federal and 3 Nosler, all had one thing in common, badly cratered primers, enough that they didn't slide easily in to the shell holder.
I re-seated the primers with a lee hand primer tool and tried again, all bar 3 of the federals de-primed easily, the 3 that didn't fit the shell holder
all had damage in the extractor groove, so I binned them.
Later on while consuming a bottle of red wine I got to thinking, as responsible re-loaders we start at a lower powder charge and work up...
What do factories do, their ammo has to be safe in any well maintained rifle ?
So is some factory ammo too hot for some guns, hence the cratered primers, or is it more likely the rifle that fired them had a fault ?
I had also noticed that the minimum book OAL for 75 grain v-max ammo is 2.640" but factory ammo I checked is 2.560' ?
Something else that would give a higher pressure for a given powder charge.