How many time are that shot volumes (cm3) less than 172.76?
gun class (pdr.) shot diameter (cm) shot volume (cm 3 ) approx. service bore (cm) mass of projectile (kg)
Caliber
175965
real real real real real
2-175965-2
Pounds as a measure of cannon bore
English gun classes c. 1800[ 
 citation needed 
 ]
2 6.04 172.76 6.64 0.90846
3 6.91 172.76 7.60 1.36028
4 7.60 230.30 8.37 1.81339
6 8.71 345.39 9.58 2.71957
9 10.00 518.28 11.00 4.08091
12 10.97 691.22 12.07 5.44269
18 12.56 1036.96 13.81 8.16499
24 13.82 1382.65 15.20 10.88696
32 15.21 1843.50 16.73 14.51572
64 19.17 3686.90 21.08 29.03063
SELECT COUNT shot diameter (cm) FROM table WHERE shot volume (cm 3 ) < 172.76
172.76