Over-spinning bullet…until they come apart

[FireFlyFishing]

Did anyone notice that a 55 grain .Projectile from a 20 inch barrel requires a 1:14 twist? Why use a 1:7 twist that stabilizes a 77+ grain Projectile in a 12 inch barrel? Just a commoner, but what about common sense? YMMV.

Is this a riddle?

 

[M118LR]

No, if you purposefully disregard the simple math of barrel length to velocity to bearing surface and Projectile weight do you think that you are going to make a breakthrough that defines mathematics? Why do you think that Uncle Sam pays all those engineers at proving grounds with funding way above common folks in yearly budgets that exceed lifetimes in a year of rounds expended?

 

[M118LR]

Statistics may lie, mathematics not so much. Yet I still wack the beads on my Old Abacus. LOL.

 

[FireFlyFishing]

No, if you purposefully disregard the simple math of barrel length to velocity to bearing surface and Projectile weight do you think that you are going to make a breakthrough that defines mathematics? Why do you think that Uncle Sam pays all those engineers at proving grounds with funding way above common folks in yearly budgets that exceed lifetimes in a year of rounds expended?

So do you have something to answer my original questions or some information that benefits the group on this subject?

 

[Doom2]

Generically speaking most cup and core bullets will survive up to around 280,000 to 300,000 RPM. Beyond that it's pretty much hit or miss. Throat and barrel conditions become critical. A velocity of ~3335 fps is going to be about 300K RPM in a 1 in 8 twist so that can be kind of a guide,