About the 203 gr hunting ammo, I found that the Barnaul 204 gr softpoint hunting ammo (steel case and all, but apparently a copper clad lead bullet) to be the most accurate commercial/milsurp load in my M39.
The S&B Match HPBT was not even as accurate at Hungarian yellow tip heavy ball I use for practice in that weapon, much less the Barnaul 204 gr.
Each gun has its own story to tell, I guess.
"Among the many misdeeds of the British rule in India, history will look upon the Act depriving a whole nation of arms, as the blackest." -- Mahatma Gandhi (An Autobiography OR The story of my experiments with truth, by M.K. Gandhi, p.238)