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Trying to equate velocity and "RPMs" of a certain twist rate is a chasing down a rabbit hole.
The twist rate "Is what it is", no matter the velocity.
A hundred yards=300ft=3600in.
In that 3600in. with a 1:7 twist barrel the bullet only revolves ~514 times.
In a 1:9 barrel the bullet only revolves ~400 times.
And the velocity doesn't matter!,, slow or fast, the turns are the same.
The idea of a bullet spinning like a top as it strikes the enemy soldier is a false perspective.
With perhaps a front-to-back travel of the bullet of ~12in. the bullet only makes a little over 1 revolution on its way thru,, if it makes it thru.
You can see that in your hunting rifle, with its much slower twist, the bullet might go thru the entire deer without revolving even one turn.
The twist rate "Is what it is", no matter the velocity.
A hundred yards=300ft=3600in.
In that 3600in. with a 1:7 twist barrel the bullet only revolves ~514 times.
In a 1:9 barrel the bullet only revolves ~400 times.
And the velocity doesn't matter!,, slow or fast, the turns are the same.
The idea of a bullet spinning like a top as it strikes the enemy soldier is a false perspective.
With perhaps a front-to-back travel of the bullet of ~12in. the bullet only makes a little over 1 revolution on its way thru,, if it makes it thru.
You can see that in your hunting rifle, with its much slower twist, the bullet might go thru the entire deer without revolving even one turn.