Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Spin and Performance
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="RockyMtnMT" data-source="post: 248446" data-attributes="member: 7999"><p>My understanding of the physics of twist on the bullet are not scientific. I have searched for information on this and then try to put it in practical terms that I can wrap my head around. So hear goes what I think I understand.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p> </p><p>The stability factor of a bullet is dependant on the overall length of a bullet, the bearing surface of the bullet, the muzzle velocity of the bullet, and the twist of the barrel. What the bullet is made out of, and how the bullet is balanced will have some bearing on how much spin it will need, and or how much it can take.</p><p> </p><p>What I understand about over-stabilization is that too much spin can bring out the imperfection of a given bullet and cause it to go down range in a circular around it's flight path. Also it can cause the jacket to separate from the core partially or completely break the bullet into pieces.</p><p> </p><p>I understand that it takes less stability factor for shooting long range (beyond 500yrds) than for shooting less than 500yrds. This I believe has to do with the bullet nosing over and coming down with the point in line of the bullet path. If the stability factor is higher it will cause the point to stay in the upward position of the beginning of the flight and enter the target in an upward angle. I believe this can be very subtle and cause the bullet to not deform properly, and not stay on the intended line through the target.</p><p> </p><p>In the point of hunting we need the bullet to stay on the path that we aimed the bullet through the intended target. A bullet that may tumble will tend to pick it's own path after impact. This could be very bad on a quartering shot as you can imagine. As I understand it the higher rotation of the bullet forces it to stay on the aimed path. So one can conclude that as much spin as the bullet can physically take would be good for short range hunting (under 500yrds). </p><p> </p><p>In my quest for information on this subject I am beginning to think I need to have two loads for a given rifle depending on the distance of the shot. Perhaps this is hair splitting. I don't know. If the target is dangerous game it becomes more important for personal safety reasons.</p><p> </p><p>I also have concluded that the further we push these bullets (velocity and range) the more noticeable these factors become. The more radical the bullet designs get, for increased bc's, the more attention needs to be paid to the twist.</p><p> </p><p>This is a great thread, I hope we can get more involvement from the really smart people around here.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p> </p><p>Thanks for the time guys, Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 248446, member: 7999"] My understanding of the physics of twist on the bullet are not scientific. I have searched for information on this and then try to put it in practical terms that I can wrap my head around. So hear goes what I think I understand.:rolleyes: The stability factor of a bullet is dependant on the overall length of a bullet, the bearing surface of the bullet, the muzzle velocity of the bullet, and the twist of the barrel. What the bullet is made out of, and how the bullet is balanced will have some bearing on how much spin it will need, and or how much it can take. What I understand about over-stabilization is that too much spin can bring out the imperfection of a given bullet and cause it to go down range in a circular around it's flight path. Also it can cause the jacket to separate from the core partially or completely break the bullet into pieces. I understand that it takes less stability factor for shooting long range (beyond 500yrds) than for shooting less than 500yrds. This I believe has to do with the bullet nosing over and coming down with the point in line of the bullet path. If the stability factor is higher it will cause the point to stay in the upward position of the beginning of the flight and enter the target in an upward angle. I believe this can be very subtle and cause the bullet to not deform properly, and not stay on the intended line through the target. In the point of hunting we need the bullet to stay on the path that we aimed the bullet through the intended target. A bullet that may tumble will tend to pick it's own path after impact. This could be very bad on a quartering shot as you can imagine. As I understand it the higher rotation of the bullet forces it to stay on the aimed path. So one can conclude that as much spin as the bullet can physically take would be good for short range hunting (under 500yrds). In my quest for information on this subject I am beginning to think I need to have two loads for a given rifle depending on the distance of the shot. Perhaps this is hair splitting. I don't know. If the target is dangerous game it becomes more important for personal safety reasons. I also have concluded that the further we push these bullets (velocity and range) the more noticeable these factors become. The more radical the bullet designs get, for increased bc's, the more attention needs to be paid to the twist. This is a great thread, I hope we can get more involvement from the really smart people around here.:D Thanks for the time guys, Steve [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Spin and Performance
Top