Sorry for the assumption. I just assumed it was an AR.
Although ... you could still be in luck.
Do you have a Sierra Reloading manual?
This is what shoots best from my Remington 700 Tactical ....
Sierra 63 gr. SMP
CCI450 Primer
25.2 gr. H335
COAL should be 2.250"
Also ... do yourself a favor and pick up some Sierra 77gr. matchking or Hornady 75 gr. AMAX bullets. You have to play with the COL on the AMAX, but it is worth the trouble.