Had some extra time to play today with my new QB 458 with a 32 inch barrel

The bullet was .459 550-grain flat point.

At 3200 psi with an average of 680 fps with a standard deviation of 5

545 FTLBS of energy at 100 yds

The group is 1 inch x 2-inch long (5 rounds)

At 4000 psi with an average of 733 fps with a standard deviation of 4

630 FTLBS of energy at 100 yds

The group is 1 1/4 x 1 1/8 (5 rounds)

The 4000-psi is only adding 15% more energy but in some cases it will be welcomed