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Hot Topic (More than 10 Replies) rate of twist (Read 14179 times)
Schuetzendave
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Re: rate of twist
Reply #15 - May 5th, 2014 at 3:15pm
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What is the length of your 136 grain bullet?
Above projections may not be right since we were estimating grains or bullet length.
The bullet stability calculation is dependent on having the exact weight and bullet length to fit into the formula.
  
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Hank45
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Re: rate of twist
Reply #16 - May 6th, 2014 at 8:48am
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Scheutzendave, I made a mistake, the bullets are length 1.090 weight 2.06 and the second one is length 1.245 and weight is 1.245 length and a weight of184.1 thank you for your answer Hank45 Smiley
  
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Schuetzendave
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Re: rate of twist
Reply #17 - May 6th, 2014 at 10:16am
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Don Miller's Twist Rule      

Caliber      0.284      Inches            
Bullet Weight      184.1      Grains            
Bullet Length      1.09      Inches            
Barrel Twist      9.5      Inches/turn            
muzzle velocity      1400      fps            
Temperature      80      degrees Fahrenheit (59 is standard)            
Pressure      29.92      inches of mercury (29.92 is standard)            
                       
Sg =      2.95                  
                 

Caliber      0.284      Inches            
Bullet Weight      184.1      Grains            
Bullet Length      1.09      Inches            
Barrel Twist      9.5      Inches/turn            
muzzle velocity      1650      fps            
Temperature      100      degrees Fahrenheit (59 is standard)            
Pressure      29.92      inches of mercury (29.92 is standard)            
                       
Sg =      3.23                  
                       
                       
                       
Caliber      0.284      Inches            
Bullet Weight      184.1      Grains            
Bullet Length      1.09      Inches            
Barrel Twist      9.5      Inches/turn            
muzzle velocity      1400      fps            
Temperature      32      degrees Fahrenheit (59 is standard)            
Pressure      29.92      inches of mercury (29.92 is standard)            
                       
Sg =      2.69                  
                       
Sg shouldn't be less than 1.4.  If Sg is greater than about 2.0, you may                        
gain some accuracy by going to a slower twist barrel.                        

Note: My previous estimates for 200 grain bullet have been modified to 206 grain bullet (above).
« Last Edit: May 6th, 2014 at 12:33pm by Schuetzendave »  
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