5.45x39mm 7n6 Romak II
2,998
3,024
3,016
3,012
3,009
2,985
2,940
3,007
2,979
Average: 2,996.7
StdDev: 25.7
Min: 2,940
Max: 3,024
Spread: 84

7.62x39mm Yugo M67 WASR-10/63
2,296
2,389
2,320
2,308
2,319
Average: 2,326.40
StdDev: 36.32
Min: 2,296
Max: 2,389
Spread: 93

7.62x39mm Silver Bear 123gr FMJ WASR-10/63
2,462
2,418
2,462
2,475
2,517

Average: 2,466.80
StdDev: 35.41
Min: 2,418
Max: 2,517
Spread: 99

The standard deviation of Silver Bear is much greater than I expected.