last year i´ve visited a 1000 Meter prone Match in swizerland. One of the Guy´s 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....
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.
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.
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.
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.