I'm guessing the caliber is .223? If this be the case, then I have had good accuracy out of 25.0gn of H4895 /w R6.5 primers. This load shot in the .3's with the Nosler J4 69gn. When I tried this same load with the Sierrra 69gn HPBT it shot even tighter. Group printed .212" @ 3004fps (100yds 3-shot group).
The rifle that I used for this load development was a Savage 110FP in .223 with the 1-9 twist barrel. Imagine my suprise when I tried the 55gn Ballistic Tip in front of 24.5-26.5gn of W748 and the R6.5 primer. My tightest group was .136", next was .162" (26.5, 25.5, respectively). This last load became my goto load for crows and such.
Good luck and have fun! JohnnyK.
“If you put our federal government in charge of the Sahara Desert, in 5 years there would be a shortage of sand." - Milton Friedman