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Author Topic: All lead bullet  (Read 7301 times)

Offline scudmaster

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Re: All lead bullet
« Reply #15 on: November 03, 2011, 08:59:33 AM »
Pay attention to the twist of your barrel.  If you have a slow twist barrel the all lead bullets will stabilize, where some conical and sabots will not.  Good luck.

Twist rate is not based on bullet composition as much as the ratio of weight, length and diameter. As a very general rule you need a faster twist rate for heavier bullets.  They are longer which changes the ratio length to diameter and distributes more weight father from the rotational axis of the bullet.  Heavier bullets need more force to spin and generally have slower velocities.  Slower speed results in lower RPMs out of the muzzle for a given twist rate.

With sabots you change the ratio of length to weight yet again and all copper changes it even more. 

ML's designed for shooting round ball have a slower twist rate 1:48" or slower.  For heavy conical bullets they are generally 1:48" or faster.

Here is a link on how to determine twist rate:

http://www.prbullet.com/twist.htm

And a chart on appropriate bullets weight for various twist rates:

http://www.prbullet.com/chart.htm

This is just for Precision's bullets, but you can see the general trend is heavier bullets = faster twist.  Hope this does not confuse you more.

Scud
« Last Edit: November 03, 2011, 09:08:02 AM by scudmaster »
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Offline gadwall

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Re: All lead bullet
« Reply #16 on: November 03, 2011, 09:50:55 AM »
Take a look at the new Harvester polymer tip bullet, Scorpion PT gold.  Harder than the Precision rifle bullets and just as accurate or better.
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