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Old June 2, 2012, 04:00 AM   #11
arcticap
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Join Date: March 15, 2005
Location: Central Connecticut
Posts: 2,973
Quote:
Originally Posted by Hawg Haggen
Also the rate of twist will determine what shoots best. 1:48 is a middle ground for conicals and round balls but not ideal for either. Anything faster will be conical only. A round ball really likes a 1:60 twist or slower.
That's only true for the larger caliber round balls. Some folks may not realize that because the smaller caliber balls are shorter in length, they actually require a faster twist. For example, the Green Mountain .36 caliber swamped profile barrel that they advertise as having a round ball twist is 1 in 48", along with having a rifling depth of .010 - .012.
GM makes one 44" swamped .40 caliber round ball barrel with a 1 in 56" twist.

http://www.gmriflebarrel.com/blackpo...dprofile44long

But all of their other .40 caliber barrels are 36" - 42" long and have a 1 in 48" twist which are known to shoot round balls with pin point accuracy at 100 yards.

http://www.gmriflebarrel.com/blackpo...iber-a-profile

http://www.gmriflebarrel.com/blackpo...iber-a-profile

http://www.gmriflebarrel.com/blackpo...-40-caliber-36

http://www.gmriflebarrel.com/blackpo...-40-caliber-42

http://www.gmriflebarrel.com/blackpo...-40-caliber-36

The different barrel makers all have their own preferred twist rates for the different caliber round ball barrels that they make.

Last edited by arcticap; June 2, 2012 at 04:24 AM.
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