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Twist Rate Required for 300gr MK Bulet

 
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  #1  
Old 07-19-2001, 09:13 AM
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Location: Calgary, Alberta, Canada
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Twist Rate Required for 300gr MK Bulet

Does anyone know the twist rate required to stabilize the .338 Sierra 300gr MK bullet?

I have access to a .338 Win Mag and would like to try some long-range hunting on game bigger than coyotes and gophers.

The rifle in question is a Rem 700 with a factory barrel of undetermined twist rate.

I looked up a twist rate chart and it only showed one twist rate for the .338 calibre. It listed 1:10 as good for "all bullets". Does this really include the big 300gr version?

Peter Cronhelm
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  #2  
Old 07-19-2001, 09:18 AM
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Re: Twist Rate Required for 300gr MK Bulet

Peter

All the 338's I've had were 1x10. I shot the 300MK out of two of them and had good results.
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  #3  
Old 07-19-2001, 09:45 AM
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Re: Twist Rate Required for 300gr MK Bulet

Thanks Dave,

I guess it is safe to order a box of these bullets then.

Peter
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Old 07-19-2001, 02:20 PM
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Re: Twist Rate Required for 300gr MK Bulet

Hi cronhelm,

last year ive visited a 1000 Meter prone Match in swizerland. One of the Guys there shot a .338" Lapua using the 300grs SMK`s from a french sniper - rifle. He finished with a 289 of a possible 300 score....
He told that the Barrel had a 1x10 Twist....

Best

Michael
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  #5  
Old 07-19-2001, 02:53 PM
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Join Date: May 2001
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Re: Twist Rate Required for 300gr MK Bulet

Cronhelm,
Yes you've got a good safety margin with the 10" twist even with the lower velocities of the 338 Win Mag. A 11" will work and I know of 1 fella using a 12" but Dan Lilja has told me that a 12" won't work. According to my caluclations a 12" is right on the line of an not-so-exact science so I'll take the word of experience here.

every 338 used in BR competition that I know of right now including my own is using a 10" twist with the 300 Sierra's. All of my impacts are cutting very good holes without hardly any measureable yaw in the paper.

The only other thing I would add though is if your using a factory 338 Win Mag that is throated short for the standard weight 338 bullets is to watcch your pressurue signs. The 300gr bullet is long and will hog up a lot of boiler room capacity raising pressure very early.

Good luck though. I've heard that this combination works really well for accuracy.

Steve
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Old 07-19-2001, 03:23 PM
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Re: Twist Rate Required for 300gr MK Bulet

Peter

At Hawks Ridge last year, I had several long chats with Rich (surname started with M but I forget it), one of the senior support guys from Sierra. I was talking to him about a 338 Lapua Improved rifle I am building and he told me to get a 1/10” twist, then I could shoot the Sierra 300gn bullet, plus the new 250gn 338 bullet Sierra had coming out. Also, Lapua make a 250gn 338 match bullet which I am pretty sure is available from Sinclair.

I think for really long range shooting, the 300gn bullet would be the go, but you just never know what an individual barrel will like.

Fergus
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  #7  
Old 07-19-2001, 05:43 PM
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Location: Calgary, Alberta, Canada
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Re: Twist Rate Required for 300gr MK Bulet

Guys,

Thanks for all the info. I called up Remington (this is a factory barrel) and actually got an answer in a minute or two. The rifle is indeed a 1:10 twist so it should work fine.

Now does anyone know of a CDN source for these bullets? The US exchange rate is a killer! [img]images/icons/smile.gif[/img]

As far as the throat goes, I have never seen a chamber with a really short throat yet. As I understand it the big bullets like to be seated into the lands somewhat so I shouldn't have any serious problems with reduced case volume due to the size of the bullet.

On another subject, I did some research today and "discovered" the .338 Rem Ultra Mag. What say you about this cartridge? I looks llike it could have some potential as a long-range cartridge due to the lack of a belt and about 200+ fps more muzzle velocity than the .338 Win mag. The cartridge is also available as a factory chambering which means it does not require a very expensive custom rifle and wildcat cases.

The Rem 700 Sendero in .338 Ultra Mag might just be the poor man's long-range hunter.

Peter Cronhelm

PS I am starting to feel bad cause I have been bitching for months about all the hunter's out there with Magnum Itus and now here I am talking about using big magnums.
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