Hodgdon Data for Hornady 124 HAP (very close to XTP)
125 GR HAP Hodgdon CFE Pistol .356" 1.069" 4.2 956 25,600 PSI 4.8 1096 33,400 PSI
125 GR HAP Hodgdon Longshot .356" 1.069" 3.9 901 24,700 PSI 4.4 998 32,600 PSI
125 GR HAP Hodgdon HS-6 .356" 1.069" 4.5 865 27,200 PSI 5.1 971 33,100 P
125 GR HAP Winchester AutoComp .356" 1.069" 3.6 842 25,000 PSI 4.1 954 31,600 PSI
125 GR HAP Hodgdon Universal .356" 1.069" 3 803 26,800 PSI 3.3 892 32,200 PSI
125 GR HAP Winchester 231 .356" 1.069" 2.8 753 25,300 PSI 3.3 876 33,600 PSI
125 GR HAP Winchester 244 .356" 1.069" 3.4 960 26,500 PSI 3.6 1060 32,600 PSI
125 GR HAP Hodgdon HP-38 .356" 1.069" 2.8 753 25,300 PSI 3.3 876 33,600 PSI
125 GR HAP IMR SR 7625 .356" 1.069" 3.3 804 25,600 PSI 3.8 914 32,000 PSI
125 GR HAP Hodgdon Titegroup .356" 1.069" 2.8 816 27,100 PSI 3.2 930 33,700 PSI
125 GR HAP IMR 700-X .356" 1.069" 2.9 843 27,000 PSI 3.4 938 33,500 PSI
125 GR HAP Winchester 572 .356" 1.069" 4 961 26,400 PSI 4.6 1074 32,800 PSI
So W231 start 2.8 MAX 3.3
Titegroup start 2.8 MAX 3.2
Hodgdons data for the HAP is quite a bit lower than for other 124s....
https://www.hodgdonreloading.com/data/pistol