Twists, Twists, and more Twists

[Slowpoke]

"Fast twist" = from 1:5 to 1:50
"Medium twist" = from 1:51 to 1:66
"Slow twist" = from 1:67 to 1:200

No, No, No

Fast is 47 and below
Medium is 48
Slow is 49 and above

this is the Slowpoke chart.... of course it depends on the phase of the moon, lube, type of flint, brand of caps, type of powder, material of patch, which direction the patch is facing, ball size, composition of said ball, humidity, and the eye of the shooter. :rotf:

 

[BS]

"Fast twist" = from 1:5 to 1:50
"Medium twist" = from 1:51 to 1:66
"Slow twist" = from 1:67 to 1:200

No, No, No

Fast is 47 and below
Medium is 48
Slow is 49 and above

this is the Slowpoke chart.... of course it depends on the phase of the moon, lube, type of flint, brand of caps, type of powder, material of patch, which direction the patch is facing, ball size, composition of said ball, humidity, and the eye of the shooter. :rotf:

That's the way I see it also! :blah:

 

[roundball]

"Fast twist" = from 1:5 to 1:50
"Medium twist" = from 1:51 to 1:66
"Slow twist" = from 1:67 to 1:200

No, No, No

Fast is 47 and below
Medium is 48
Slow is 49 and above

this is the Slowpoke chart.... of course it depends on the phase of the moon, lube, type of flint, brand of caps, type of powder, material of patch, which direction the patch is facing, ball size, composition of said ball, humidity, and the eye of the shooter. :rotf:

And don't forget other critical considerations:
1) Left or right hand twist
2) Above or below the equator

 

[fho]

to find twist for round ball:

Cox's formula is: pi x bore diameter divided by .029

Ed Rayl's formula is: pi x bore diameter divided by .02618

pi = 3.14159

 

[BS]

to find twist for round ball:

Cox's formula is: pi x bore diameter divided by .029

Ed Rayl's formula is: pi x bore diameter divided by .02618

pi = 3.14159

Looks GOOD! :applause:

 

[CoyoteJoe]

I have been mistaken before but I believe the L, length in Greenhills is NOT the length in inches but in bullet diameters. Since round balls are always one diameter long and 150 times one is still 150 you can skip that step and just multiply 150 times the diameter. But for elongated bullets if you come out with a number such as 1.56 for a .50 caliber 1:48 twist, it does NOT mean it will stabilize a bullet 1.56 inches long, but 1.56 times the diameter or about 0.78 inches long.
Theory is fine but theoritically a 48 inch twist will not stabilize a T/C maxi-ball and I have seen fine accuracy from them so I don't take anything as carved in stone. :grin:

 

[Norskie]

No rule should be followed off a cliff.

 

[roundball]

to find twist for round ball:

Cox's formula is: pi x bore diameter divided by .029

Ed Rayl's formula is: pi x bore diameter divided by .02618

pi = 3.14159

:hmm: ...for a .45cal:

Cox formula = 1:48" twist
Ed Rayl's = 1:54" twist

 

[BS]

to find twist for round ball:

Cox's formula is: pi x bore diameter divided by .029

Ed Rayl's formula is: pi x bore diameter divided by .02618

pi = 3.14159

:hmm: ...for a .45cal:

Cox formula = 1:48" twist
Ed Rayl's = 1:54" twist

.50 cal:

Cox formula = 1:54" twist
Ed Rayl's = 1:60" twist

ETC: :winking:

 

[roundball]

Interesting that TC and GM use 1:66" and 1:70" twists for those calibers.