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Old January 5, 2020, 02:09 PM   #6
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 12,454
You can calculate until the cows come home and you'll still find that barrels come in standard for calibre twists. Unless you pay very big money for a custom twist.
"...the heaviest/longest bullet..." Heaviest.
"...Do they..." According to that Newton fellow's laws, objects in motion will stay in motion until force is applied to change that motion. Changing velocity doesn't affect the rotation of a bullet.
Read this. Note that the Berger calculator needs environmental variables and that it's just a guess like all calculators of the type. You should also remember that bullets are not stable when they come out of the barrel. That takes time and distance. In the case of a .30-06/.308 it's about 300 yards.
http://bulletin.accurateshooter.com/...t-rate-and-mv/
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