Twist rate pressure

[trex]

223 Rem. If you shoot a 50-grain bullet in a 1-12 twist 24" barrel and shoot the same bullet in a 1-9 twist 24" barrel
want the 1-9 twist create more pressure for the same velocity?

 

[Jcalder]

Just spins it faster

 

[nso123]

If you want to take a deep dive…

Rifling Twist-Rate Effect on Chamber Pressure

Just saw a mention that some new gun shown at this year's SHOT Show comes with a 3-inch twist rifled barrel. Some barrel makers have made those kind of twist-rates for ballistic test barrels used for short-range, reduced velocity testing of subsonic bullet behavior or extreme range terminal...

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