Not sure why you refer to every shitty PH rifle that you have seen.....
All experienced dg PH I know have well used reliable rifles with ammo that works....in most cases self loaded.....
Now inexperienced "Need for speed" clients are a totally different thing.....
Sh&tty rifle definition: due to excess wear and tear, lack of cleaning, and overpressure loads they have a number of overt and latent defects. Many of these are accelerated wear defects due to extreme performance hand loads. Of particularly frequent occurrence are trashed 458 Winmags that are often loaded way past traditional performance specs in a desire to get closer to Lott functional levels in a gun that was not engineered for the vastly increased recoil.