Thread: FMJ on animals

that's an over simplification
many variables to take into effect
all FMJ is not made the same or indeed designed to behave the same way
the tumbling is caused by projectile getting off balance enough to yaw and switch ends thus starting to tumble
too fast of rifling SHOULD stop it..too slow and it happens sooner taken to extreme..too fast could make projectile pull itself apart through centrifugal force etc too slow and it will tumble and key hole straight away...centrifugal force?????? take bullet traveling 3000fps in a 1 in 12" twist........ that's 3000rev per SECOND times by 60 secs per minute = 180,000rpm
projectiles designed to tumble..the MK5?? .303 Has soft light stuff in front of lead core making bullet tail heavy...upon impact it wants to switch ends especially if hit at angle..same can be done by having slow rifling making projectile barely stable in flight.
hope that explains it better.