Guessed, ran 6.5 grs with 230 gr Gold Dots for decades, called it +P because Barnes runs the same bullet [185 X] at or around 975 fps with their load data.
No blowups, not even close, have taken the 1911 platform with heavier springs to 1200 fps with 230 gr FMJ-FP bullets in 45 Super Brass.
