OP, you are giving way to little information for anyone to make even a close guess..
Twist rate. Barrel length. Primers. Actual group size. How clean the bore is(copper fouled).
I have a couple of 30-06 rifles with 26 in barrels and get just slightly over the 2800fps with Speer GS bullets and 58.0 grains of H4350 over standard CCI 200 primers. 1-10 twist rate in the Ruger #1 and 1-12 twist rate in the brno. As you mentioned, accuracy left a lot to be desired. 2-3 moa.
I switched to 59gr of H414SL10 and gained about 75 fps on average, used magnum primers because it's a ball type powder for better ignition. H414sl10 is about 1% slower than W760 but IMHO way more consistent. The rate of burn is also just about identical to both IMR and H 4350. Maybe just a hair faster. Pressures are likely a bit over 50,000 psi though. The thing is, accuracy is sub moa.
If I can make a suggestion, switch to magnum primers with your same 56gr load. Some place along the way you have either a consistency issue with one or more of your components or your rifle doesn't like SGK bullets. It happens.
If you are getting close to the advertised velocities and your groups are 1-1.5 moa at 100 yards, that is fine hunting accuracy.