My former 1/9 liked the 69 smk and Hornady 75 hpbt over Varget at or near max out to 400y, didn't test any farther.
It would shoot the factory 53 Superformance well to at least 200m, I never grouped them at any longer distance.
My xcrl likes the 50 gr AE red box JHP but it is was only 1 5/8" at 100m the only time I validated a zero. It is 1/9 I believe.
The Ttsx, etc never shot well for me in a 243 (95 gr was what I tried or maybe 90, wasn't worth remembering)