Guns that look identical wont necessarily shoot the same load so throughly test everything.
As a starting point this is what my Triumph likes.
250 Gold Dot- 110 gr BH or 777 some groups under 3/4 minute of angle under most conditions, most one hole groups have been with BH209
200gr SW 50/40 110 or 120 BH209 one ragged hole to one and a quarter
300 Gold Dot-100gr BH or 777 one to 1.25
250 SW -110gr BH or 777 one to 1and a half inches
300gr SW 110 gr BH one and a half
Hornady FPB 350gr 100 or 110gr one inch
Since I am over 70 and my eyes have been giving me trouble a better shooter could do better with the same gun and loads. Lee