Well some P-H rifles are OK and some aren't. I had two in .270 where cartridges fired in one would chamber in the other but not vice versa. In fact they almost looked pregnant in that crucial web area.
Bill, ex P-H, at Norman Clarke checked it out and advised it was, as he said, "a typical slack P-H chamber". If anyone was qualified to use that expression he certainly was. There it is.
Tightest chambers, from same period the 1980s and 1970s I've known tend to be on German made commercial rifles or Austrian rifles.