Part II of "Requirements for replacements of currently issued 5.56 M-855 and 7.62 M-8

[JASmith]

Concur -- we need tests!!

...it's questionable if yaw can be made to happen at 7cm, let alone 5cm.

Judging by Fackler's wound profile drawings, it looks as if the best that might be achieved -- with FMJ bullets having lightweight material (such as aluminum) in the nose, to shift CG rearward -- is onset of yaw at ~10cm, as with the .303 MkVII round...

Kinda looks that way to me too. On the other hand, the words we're referring to are in the objective statement. Hence we are allowed to push the edge of do-ability since no harm accrues to a contestant for falling short -- unless a competitor finds a way to make it happen!

The project would be in real trouble if we write a threshold statement that no solution could meet! So, the rule of thumb is:

• Threshold = doable within reason while satisfying all the other thresholds.
  
• Objective = can be a stretch if remotely in reach. These help spell out what we really want but aren't sure they're doable. (Shouldn't write them if we know they are out of reach!)
  

FWIW, non-fragmenting FMJ rifle bullets typically penetrate about 60cm into gelatin, so specifying 30-40cm is hardly a challenge.

I think the 40cm in the objective was a typo. I was thinking of a half-meter, which is a tad more than two feet. Have corrected the statement in post #18 above.

The real question is -- can we identify a payoff for penetrating deeper than 50 cm?