Having a hard time getting Berger 80.5 full bore to shoot

[rebs]

I have a Savage 12 barrel 30" with 1/7 twist on a Savage right bolt left port single shot action with a target accu trigger with red blade.. I am having a hard time finding an accurate load for it with Berger 80.5's and Varget. I have loaded 20 off the lands with 24.4, 24.5, 24.6, 24.7 and 24.8 of Varget, At 24.7 I get a nice round group but not very small. What should I try to shrink the group size?
Does this bullet like more jump or closer to the lands?
I forgot to add this barrel has about 500 rounds through it.

[Fuj']

Drop back to 24 grs, and set it for touch. If the group goes vertical add more powder. If the
group goes horizontal, go in .003 at a time until it comes together. If none of the above works,
Varget may be the problem. How is the case fill, and are you using a chrono ??

[rebs]

Drop back to 24 grs, and set it for touch. If the group goes vertical add more powder. If the
group goes horizontal, go in .003 at a time until it comes together. If none of the above works,
Varget may be the problem. How is the case fill, and are you using a chrono ??

Yes I did chrono 24.5 varget gave me 2818 velocity, case was not full. 1.988 is 20 off hard jam.