Does twist rate affect pressure?

L

longcummins

New member
So as the title ask how much does the twist rate change pressure on a given round. Lets say going from a 1 in 10 twist to a 1 in 7 in a typical ar-15 5.56. This is something I have been curious about for quite some time. Thanks for any information or experience that you can or will share.
 
I don't know.

But . . .

Logic tells me that a higher twist rate will increase the bullet's "reluctance" to travel down the barrel. A corresponding increase in pressure would result.

Like you, I'll be waiting for someone more educated than me on the subject to chime in.
 
Twist rate change is ONE of the variables in pressure. Odd or Even lands and grooves? Smoothness of bore? Loose or tight tolerance bore? Freebore
? Etc.
 
It does. Since it takes energy to spin a ~ cylinder at 100K RPM, then that energy has to come from somewhere. That spin energy will slow the bullet down, increasing the pressure. If if didn't then that energy would go into pushing the bullet faster down the barrel.

How much energy, and the resulting pressure delta, is left as an exercise to the reader :)
 
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