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<blockquote data-quote="strictlyRUM" data-source="post: 255862" data-attributes="member: 5405"><p>Thank you much Jeff. Well the miller formula says I am good to go.</p><p> </p><p><strong><span style="font-family: 'Arial'"><span style="font-size: 22px">Don Miller's Twist Rule</span></span></strong></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Caliber </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">0.284 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">Inches</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Bullet Weight </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">189 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">Grains</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Bullet Length </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">1.56 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">Inches</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Barrel Twist </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">8 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">Inches/turn</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">muzzle velocity </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">2950 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">fps</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Temperature </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">80 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">degrees Fahrenheit (59 is standard)</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Pressure </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">29.92 </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">inches of mercury (29.92 is standard)</span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 18px">Sg =</span></span><span style="font-family: 'Arial'"><span style="font-size: 18px">1.93</span></span></p><p><span style="font-size: 10px"><span style="font-family: 'Arial'">Sg shouldn't be less than 1.4. If Sg is greater than about 2.0, you may </span></span><span style="font-family: 'Arial'"><span style="font-size: 10px">gain some accuracy by going to a slower twist barrel.</span></span></p><p></p><p></p><p> </p><p> </p><p> </p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">As far as BC I am guessing closer to .800 if not over. Bergers do not have rebated boattails and or closed tips like the Cauterucios. The last 176s I had I was getting a BC of .740 out of my 7RUM at 3300. Cant wait to get this project under way!</span></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 10px">Jason</span></span></p></blockquote><p></p>
[QUOTE="strictlyRUM, post: 255862, member: 5405"] Thank you much Jeff. Well the miller formula says I am good to go. [B][FONT=Arial][SIZE=6]Don Miller's Twist Rule[/SIZE][/FONT][/B] [FONT=Arial][SIZE=2]Caliber [/SIZE][/FONT][FONT=Arial][SIZE=2]0.284 [/SIZE][/FONT][FONT=Arial][SIZE=2]Inches[/SIZE][/FONT] [FONT=Arial][SIZE=2]Bullet Weight [/SIZE][/FONT][FONT=Arial][SIZE=2]189 [/SIZE][/FONT][FONT=Arial][SIZE=2]Grains[/SIZE][/FONT] [FONT=Arial][SIZE=2]Bullet Length [/SIZE][/FONT][FONT=Arial][SIZE=2]1.56 [/SIZE][/FONT][FONT=Arial][SIZE=2]Inches[/SIZE][/FONT] [FONT=Arial][SIZE=2]Barrel Twist [/SIZE][/FONT][FONT=Arial][SIZE=2]8 [/SIZE][/FONT][FONT=Arial][SIZE=2]Inches/turn[/SIZE][/FONT] [FONT=Arial][SIZE=2]muzzle velocity [/SIZE][/FONT][FONT=Arial][SIZE=2]2950 [/SIZE][/FONT][FONT=Arial][SIZE=2]fps[/SIZE][/FONT] [FONT=Arial][SIZE=2]Temperature [/SIZE][/FONT][FONT=Arial][SIZE=2]80 [/SIZE][/FONT][FONT=Arial][SIZE=2]degrees Fahrenheit (59 is standard)[/SIZE][/FONT] [FONT=Arial][SIZE=2]Pressure [/SIZE][/FONT][FONT=Arial][SIZE=2]29.92 [/SIZE][/FONT][FONT=Arial][SIZE=2]inches of mercury (29.92 is standard)[/SIZE][/FONT] [FONT=Arial][SIZE=5]Sg =[/SIZE][/FONT][FONT=Arial][SIZE=5]1.93[/SIZE][/FONT] [SIZE=2][FONT=Arial]Sg shouldn't be less than 1.4. If Sg is greater than about 2.0, you may [/FONT][/SIZE][FONT=Arial][SIZE=2]gain some accuracy by going to a slower twist barrel.[/SIZE][/FONT] [FONT=Arial][SIZE=2]As far as BC I am guessing closer to .800 if not over. Bergers do not have rebated boattails and or closed tips like the Cauterucios. The last 176s I had I was getting a BC of .740 out of my 7RUM at 3300. Cant wait to get this project under way![/SIZE][/FONT] [FONT=Arial][SIZE=2]Jason[/SIZE][/FONT] [/QUOTE]
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