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twist needed for .308" 240g SMK's??

 
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  #1  
Old 06-03-2008, 08:40 PM
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twist needed for .308" 240g SMK's??

hey, i am now the prowd new owner of a custom 300 ultra mag, was looking for a gun to build a 338 edge but this kinda just jumped out at me, it is a remington 700 action, h-s precision stock w/ adjustable cheekpad and LOP. and a 30" stainless barrel with a muzzle brake.
i'm wonderin what twist is needed for these heavy bullets, i'm in the process of tryin to figure out the twist in the barrel but my dewey rod is bein a pain.
i would like to try sierras 240 if at all possible, but may settle for any in the 200-220 range
also wonderin what kinda loads should i try in it?? its my first experience with a big 300, other than a 300 win that wouldn't shoot baseballs at 100 yds.
thanks
also shoppin for a scope and rings/base as i speak!!! any advice is appreciated, i'm a novice at long range,,,, 500 is about as far as i've shot.. but really wanna shoot at 1000+ what do i need to get started??
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  #2  
Old 06-03-2008, 09:18 PM
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Join Date: Jul 2004
Location: Texas
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Cowboy

Most custom 30 cal barrels have a 1 in 10 twist, If so then it will be fine for
240's in the big RUM.

As far as scopes I would recomend a tactical with side focus,30mm tube,
50mm objective and 4 to 6x 14 to 20 power.

The brand would be determined by how much money you are willing to spend.

J E CUSTOM
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  #3  
Old 06-04-2008, 04:38 PM
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240SMK 1:10" twist

Peter
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  #4  
Old 06-04-2008, 08:15 PM
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1 in 10 will stabilize the 240 at 300RUM velocities. However, Sierra says to use 1 in 9 for the big 240. I'm shooting 104.5g US869 at 3K MV with the 240 resting on the lands. This is a cold weather load. At least 60F or below. 4-6 firings. Good luck.
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  #5  
Old 06-13-2008, 07:02 PM
Lightvarmint
 
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Hello,

It really depends on air density and bullet speed.

james
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  #6  
Old 06-21-2008, 11:05 PM
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Join Date: May 2006
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Twist Rate

1:10" for the 240 SMK in .308 cal, even at this altitude.
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