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Proper Twist 300 WM ?

 
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  #1  
Old 04-05-2010, 01:25 PM
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Proper Twist 300 WM ?

Hello All,

For a 300WM shooting 165gr and 180gr bullets what would be the best twist option?

If there are a couple of choices can someone list the pros and cons of each?

Thanks

Tom
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Old 04-05-2010, 06:40 PM
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Re: Proper Twist 300 WM ?

Quote:
Originally Posted by statjunk View Post
Hello All,

For a 300WM shooting 165gr and 180gr bullets what would be the best twist option?

If there are a couple of choices can someone list the pros and cons of each?

Thanks

Tom
If you are sue that you won't ever want to shoot heavier bullets, a 12 twist would probably be best. An 11 twist will handle up to about 200 gr. and anything above would require a 10. The idea is to not over twist as long as you are covering the desired weights. The faster the bullet rotation, the more any imbalance in the bullet will be accentuated........Rich
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Old 04-05-2010, 07:58 PM
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Re: Proper Twist 300 WM ?

What would be the difference if I were to go with an 11 twist and shoot 165 and 180gr bullets vs going with a 12?

Thanks for your help.

Tom
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Old 04-05-2010, 11:27 PM
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Re: Proper Twist 300 WM ?

Quote:
Originally Posted by statjunk View Post
What would be the difference if I were to go with an 11 twist and shoot 165 and 180gr bullets vs going with a 12?

Thanks for your help.

Tom
An 11 twist would be ok but again, would spin the bullet slightly more than necessary for those weights. It IS better to error on too much twist than not enough and an 11 would allow heavier bullets if you so choose......Rich
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Old 04-06-2010, 12:14 AM
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Re: Proper Twist 300 WM ?

Rich is basically right, but to be most correct, bullet length determins required twist more than weight.

The standard twist in the 30 calas is 10". I dont think you will ever be able to tell the difference between a 10 and 12 twist barrel in your shooting and 10 twist barrel will allow you to shoot higher BC bullets.

Whenever I get a 30 cal barrel ordered it will be a min of a 9 twist, if not an 8 to shoot the high BC bullets.

-Mark
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Old 04-06-2010, 06:48 AM
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Re: Proper Twist 300 WM ?

I'm setting up to mostly shoot accubonds. Would those benefit from the 11 twist over the 12?

However, I may want to shoot the 208gr Hornady A-Max bullet.

Any of this change the proper choice of twist?

Thanks

Tom
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  #7  
Old 04-06-2010, 07:45 AM
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Re: Proper Twist 300 WM ?

Tom,

What is your shooting goal? If LR shooting is your goal, it is best accomplished with high BC bullets. High BC bullets require a faster twist. High BC bullets have high BC because of their shape which is long and pointy, which is why they require a tight twist. If you gi to the Berger site, you will see that a 210 Berger requires an 11 twist (minimum) The 208 Amax has a very similar BC as the 210 Berger which means, that at the same weight, they are about the same length and probably require the same twist.. IMO, trying to decide between a 10 and 11 twist or 12 twist is the same as straining at gnats. This is something that BR shooters do and they are usually shooting a different type bullet (flat base often) than LR shooters, and different type of rifels.

If you go with an 11 twist, you will be able to shoot all of the common comercially available bullets but you wont be able to shoot the LR friendly, high BC bullets.

-Mark

Last edited by MontanaRifleman; 04-06-2010 at 10:11 PM.
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