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QB 458

March 23 2012 at 9:06 PM

David Williams  (Login jr460)
from IP address 173.187.200.252

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
[linked image]

 
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