This seems like a long involved thread to answer a “change back to your original bullet” to regain accuracy problem.
I bought an original Vanguard in 300 weatherby for $260 on Gun broker delivered as an extra elk gun that wouldn’t break my heart if stolen from the truck. My only request from the seller was a reasonable trigger pull - sadly it was horrible & the gun shot a little over an inch at best. I broke down spent $100 & 10 minutes on a Timney and it clover leafed 180.grain TTSXs. Less than 1/2 the original group size with a 2.5 lb ultra smooth instant break. It is my 1st string elk gun & with aZeiss conquest HD5 Z800 that matches the trajectory perfectly it is a sure thing killer to 600 yards all day.
It is so popular with my hunting group my cousin & son in law both bought S2 300’s & both shoot very well. Future son-in-law wants it on his list when I kick the bucket......so I’m a fan of a trigger swap on the old Vanguard for sure.
