In keeping with my untarnished history of dumb questions...

[roundball]

"...if it is shot out of a 1:60 twist barrel, the same ball in your calculations is spinning at:
1 rev in 60 inches/12 inches = 1 rev/5 feet. 2000 FPS/5 feet = 400 rev/second X 60 sec/min = 24000.0 RPM..."

Well, let's think through this together because I'm not totally on the same page yet.

On the one hand the "wind blast number of 1,363mph is "real & actual"...it actually occurs.

However, while 24,000rpm is an impressive sounding number, it never really happens, right?
The event is over in what...a millisecond?...24,000rpms is never actually realized...nothing actually spins 24,000 times...it's over in a flash, pun intended...so I don't see fraying being caused by barrel[url] twist...in[/url] fact, don't we get frayed patches out of smoothbores?

:hmm:

 

[Poor Boy]

:shake: When shooting a round ball in a 1:60 or simular SLOW twist, there ain't much of a spin, compared to a conical in a fast twist barrel.

Olson

 

[paulvallandigham]

The fraying is most likely caused by the patch hitting the air and being violently snapped back as the ball it is wrapped around leaves the patch outside the muzzle of the barrel. The patch " Brakes" is a very short amount of distance, and the deceleration is what causes the ends to fray. You are right: we do get frayed patches from smoothbore, too. Its not caused by the rifling. However, if you have holes in the patching, that can be caused by rifling that has a burr on an edge, or if the rifling at the muzzle is sharp, and cuts the patch when you seat a very tight ball combination. Burn holes look different than cut holes in patching, but that generally occurs because you use too thin a patch.

 

[paulvallandigham]

The fraying is most likely caused by the patch hitting the air and being violently snapped back as the ball it is wrapped around leaves the patch outside the muzzle of the barrel. The patch " Brakes" is a very short amount of distance, and the deceleration is what causes the ends to fray. You are right: we do get frayed patches from smoothbore, too. Its not caused by the rifling. However, if you have holes in the patching, that can be caused by rifling that has a burr on an edge, or if the rifling at the muzzle is sharp, and cuts the patch when you seat a very tight ball combination. Burn holes look different than cut holes in patching, but that generally occurs because you use too thin a patch.