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The Basics, Starting Out
Bullet weight selection
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<blockquote data-quote="muleystalker" data-source="post: 1692241" data-attributes="member: 79944"><p>Steve, speed doesn't change the twist rate factor that much for a given bullet in the speeds we are talking about. In your statement you give a speed of 2000fps compared to 3100fps, this is not a practical example. no one is shooting a 2000fps cartridge and then gaining 1100fps. Maybe more like 2850fps for a given bullet and then pushing it up to 3150-3200fps with a magnum is a more realistic scenario. Now pick a given weight bullet say at 2900fps, keeping all perimeters the same( altitude,bullet,barrel twist) plug in the speed of 3100-3200fps and see how much it changes the twist rate factor, not much.</p><p></p><p> In my example with mono's I was illustrating that the mono is lighter and shooting quite a bit faster than the heavier lead bullet but still needs a faster twist barrel than the same weight in a lead core bullet because of the longer length of the bullet. You could add 300 to 400fps to the lighter mono bullet but it won't change that much on the twist required, showing that speed doesn't affect the twist required that much at all.</p><p></p><p> The biggest reason guys will go a little slower rate of twist when shooting/pushing a given bullet at a faster velocity isn't because you don't need the faster barrel twist, its because you can only push a cup and core bullet so fast threw a faster twist barrel before you start blowing up bullets(ripping the jacket of of them). There is a fine line on bullet jackets, speed and barrel twist. You can push the mono's a lot harder but when you run the numbers it will show you speed doesn't make that significant of a change in the twist rate required for a given bullet, all other factors staying the same.</p><p></p><p> Also if you look there are some good choices for high B.C. to weight mono bullets out there, I'm not talking Hardy, Barnes and such. There are Hammer bullets that have some great choices, Badlands bullets and Cutting Edge. I am building a 6 SST and going to shoot the Badlands Bulldozers 6mm 100gr bullet with a G1 B.C of .575 not bad for a 6mm 100gr Monolithic. I will be shooting it about 3500fps. The 6 SST will shoot the 115gr DTACS at 3500+.</p></blockquote><p></p>
[QUOTE="muleystalker, post: 1692241, member: 79944"] Steve, speed doesn't change the twist rate factor that much for a given bullet in the speeds we are talking about. In your statement you give a speed of 2000fps compared to 3100fps, this is not a practical example. no one is shooting a 2000fps cartridge and then gaining 1100fps. Maybe more like 2850fps for a given bullet and then pushing it up to 3150-3200fps with a magnum is a more realistic scenario. Now pick a given weight bullet say at 2900fps, keeping all perimeters the same( altitude,bullet,barrel twist) plug in the speed of 3100-3200fps and see how much it changes the twist rate factor, not much. In my example with mono's I was illustrating that the mono is lighter and shooting quite a bit faster than the heavier lead bullet but still needs a faster twist barrel than the same weight in a lead core bullet because of the longer length of the bullet. You could add 300 to 400fps to the lighter mono bullet but it won't change that much on the twist required, showing that speed doesn't affect the twist required that much at all. The biggest reason guys will go a little slower rate of twist when shooting/pushing a given bullet at a faster velocity isn't because you don't need the faster barrel twist, its because you can only push a cup and core bullet so fast threw a faster twist barrel before you start blowing up bullets(ripping the jacket of of them). There is a fine line on bullet jackets, speed and barrel twist. You can push the mono's a lot harder but when you run the numbers it will show you speed doesn't make that significant of a change in the twist rate required for a given bullet, all other factors staying the same. Also if you look there are some good choices for high B.C. to weight mono bullets out there, I'm not talking Hardy, Barnes and such. There are Hammer bullets that have some great choices, Badlands bullets and Cutting Edge. I am building a 6 SST and going to shoot the Badlands Bulldozers 6mm 100gr bullet with a G1 B.C of .575 not bad for a 6mm 100gr Monolithic. I will be shooting it about 3500fps. The 6 SST will shoot the 115gr DTACS at 3500+. [/QUOTE]
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