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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For MgCO3 (Magnesium Carbonate)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.018369 -0.010982 -0.013959 -0.007458 -0.020427 -0.020427 -0.022906 -0.202411 -0.202411 -0.042657 -0.141239 -0.012982 -0.076355 -0.016976 -0.088827
MP3=FULL         -0.019738   -0.022279       -0.143785 -0.012176 -0.077158    
MP4=FULL   -0.010651     -0.020169       -0.205676     -0.012409 -0.078280 -0.016397 -0.091773
B2PLYP=FULL -0.006156 -0.003424 -0.004401 -0.002329 -0.006273 -0.006273 -0.007052 -0.059474 -0.059474 -0.012767 -0.041715 -0.003988 -0.022790 -0.005269 -0.026421
Quadratic configuration interaction QCISD(T)=FULL         -0.020188             -0.012418 -0.078455 -0.016451 -0.091978
Coupled Cluster CCSD=FULL         -0.019780         -0.042871 -0.144652 -0.012130 -0.077229 -0.016175 -0.090701
CCSD(T)=FULL         -0.020180           -0.146118 -0.012411 -0.078436 -0.016456 -0.091956
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ aug-cc-pVDZ aug-cc-pVTZ