In my opinion...
It all depends on your accuracy expectations. But best accuracy drops off in the 6.5 PRC probably around 1,000 to 1,500 rounds depending on what you're using it for.
F-class is probably good for 1,000 - 1,200 rounds.
PRS probably good for 1,500 because even 1/2 moa will get you by no problem.
Hunting big game only ? Probably 2,000 rounds or 2,500 at most. because 3/4 to 1 moa will still get the job done.
It all depends on your accuracy expectations. But best accuracy drops off in the 6.5 PRC probably around 1,000 to 1,500 rounds depending on what you're using it for.
F-class is probably good for 1,000 - 1,200 rounds.
PRS probably good for 1,500 because even 1/2 moa will get you by no problem.
Hunting big game only ? Probably 2,000 rounds or 2,500 at most. because 3/4 to 1 moa will still get the job done.