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November 26, 2017
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Can anyone tell me the rifling twist rate on the new 715 revolvers?
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July 2, 2011
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February 16, 2016
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November 17, 2012
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In the black "The Innovators" brochure they also list 1 in 14 as an option for the 10", 12" and 15" old style barrels, anyone with experience shooting one of those? Bullet weight recommendations?
February 16, 2016
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DWpistolpackin said
In the black "The Innovators" brochure they also list 1 in 14 as an option for the 10", 12" and 15" old style barrels.
The 1:14 ratio was not an option for the 10", 12" and 15" barrels, that is the only twist rate they came in. But those barrel lengths are not available with the new 715 that the OP asked about.
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March 25, 2013
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Stinger, you da bomb.
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November 17, 2012
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Good info, so ALL 10"+ barrels have a 1 in 14 twist?
BTW, CZ shows 10" available (but not currently in stock) on their website for both blue and stainless, wouldn't the SS be a match for the new 715 or is this a different configuration?
My understanding is that these were for heavier grain bullets. The heaviest I have shot is the 158 grain - was something else used?
February 16, 2016
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DWpistolpackin said
So ALL 10"+ barrels have a 1 in 14 twist?
All factory barrels do ... but, EWK .357 Magnum barrels are 1:12 for 2-1/2″ thru 10″ lengths.
Twist rate uses both bullet weight and velocity variables, to derive the appropriate ratio. It has to do with moving mass to a certain velocity within a specific time duration. A heavier mass requires a slower twist than a lighter mass to start rotating.
If you increase velocity, the mass is moving quicker down the barrel, so with the same twist, it would be trying to rotate the mass too fast, so they slow the twist rate the faster the velocity is. If you push a bicycle down the street, you can easily start running immediately. If you push a motorcycle, you have to start off slower, to get the mass moving.
The heavier the projectile, the slower the twist rate, so the higher the ratio number (1:5 is faster than 1:10). The constant of 1 equals one full rotation of the bullet and the second number is how many inches it takes to accomplish it.
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February 22, 2009
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I think you just made my head hurt...
Heavy for caliber bullets typically require a faster twist. Here's a good calculator: JBM Ballistics
Technically, the glass is always full; half liquid, half air....
November 26, 2017
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So 1 in 18-3/4″ is the correct answer for current 4,6,8" barrels?
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February 22, 2009
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Technically, the glass is always full; half liquid, half air....
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