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Barrel Twist vs. Bullet Weight

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Unread 01-13-2007, 09:23 AM
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Join Date: Jan 2007
Location: Scottsdale, AZ
Posts: 113
Barrel Twist vs. Bullet Weight

<font color="blue">I have a 300 WM with a Douglas Premium XX Air-Gauged barrel with a 1/10 twist – intending to shoot 200g bullets. A close friend suggests that 180g bullets are the ‘optimum’ 30-caliber bullet (a subjective opinion to say the least).

My question is, will the faster 1/10 twist of my barrel degrade the accuracy of a 180g bullet by spinning it ‘too fast’. If so, what is the logic behind that?

Looking forward to some interesting answers.</font>
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Unread 01-13-2007, 10:09 AM
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Join Date: Jul 2004
Location: Texas
Posts: 7,193
Re: Barrel Twist vs. Bullet Weight


You would have to reach 3400 to 3500 fps before over
rotation would occur.

A 1 in 10 twist is very good in a 300win mag and will
shoot the 220gr bullets well also.

I have only had this problem once ,And it was a 32" 1in9 twist barreled 7STW with 120gr bullets exceeding 3800fps
accuracy started going away at around 3700fps.

You should be fine with 150 to 240 gr bullets, and your
rifle will tell you which one it likes best.

As the ausies say NO WORRIES MATE
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Unread 01-13-2007, 01:31 PM
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Join Date: Nov 2005
Location: Riggins Idaho
Posts: 1,195
Re: Barrel Twist vs. Bullet Weight

The 180 gr. ballistic tip is good along with the 200gr. accubond and the 210 berger. The 180gr bullet is not the only way to go but will work fine
I dont know who ever came up with the imaganary word of "Over Gunned"
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Unread 01-13-2007, 02:33 PM
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Join Date: Feb 2004
Location: Pennsyltucky
Posts: 2,630
Re: Barrel Twist vs. Bullet Weight

Karl, i would be willing to bet that your best accuracy will happen with the 200-220 gr bullets.

JD, the accuracy starting to deteriorate after 3700 was probably more a problem with the bullet not being able to take the RPM's from a structural standpoint and not an over rotating stabilization issue.
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