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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...

I was asked several years ago by David Tubb to explain ballistically why crosswinds favored riflemen shooting barrels made with twist direction matching the crosswind direction--L to R winds favoring LH twist barrels, and vice-versa. I could find nothing in aeroballistics showing any asymmetry...

I am attaching a paper reporting where we now stand in development and testing of a new monolithic copper ULD bullet design for ELR rifle shooting. I now see that practical accuracy is a limitation on how fast these bullets should be spinning out of the muzzle. I am changing my rifling twist...