Recently bought a .243 model 7 for my son. It came with a box of 95gr sst hornady factory ammo that was grouping 3/4 inch. I have a very limited reloading selection here so I ended up with the 100gr GS bullets. I can not get them under 2.5" at 100 yds. Is this to be expected out of the GS bullet? I have tried various loads and seating depths and have been loading for years. Any suggestions or I could always mailorder some different bullets.