I was plugging in some bullet weights in Berger’s spin stability calculator.
Specifically looking at 77gr in 1/9 twist. At first it was “ahh, that’s marginal.”
Then I added in the elevation I live at now (4700’) and it was {thumbs up} GTG.
Does this match your experience?
This curiosity was started when I saw a show featuring Da Boss of Black Hills Ammo shooting the commercial version of the military MK 262 MOD 1.
While we can’t buy that, (for ourselves but we can buy it for others
) we CAN buy its commercial equivalent, the MK 262 MOD 1-C.
Same accuracy requirements:
these rounds come with the same no-nonsense lot acceptance accuracy test (10 groups of ten shots each at 300 yards) provided on military lots. No lot will ship unless it shoots sub 2″ groups (.64 MOA maximum/10 shot groups).Not having that load, I picked up some 77gr Fiocchi and 75gr Hornady.
Range trip!!!