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338 Cal, What Chamber to use?

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Old 11-28-2003, 07:59 AM
Silver Member
Join Date: Nov 2003
Location: La Grange, TX
Posts: 222
Re: 338 Cal, What Chamber to use?

Does anyone know if my 300 bolt face can safely be opened to that size? Anyone have suggestions as to someone that would rebarrel to a 338 Yogi or similar round for me? I'll provide the barrel and action? I'm in Central TX but don't reallly care where a good smith is. My AR smith is located in Illinois as an example.

Get as close as you can, but utilize your skills as needed.
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Old 11-29-2003, 01:42 AM
Platinum Member
Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: 338 Cal, What Chamber to use?


I'm not sure if it's the same one they chamber the 338/378 Wby in or if it is doable. Chris at G.A. Precision is who I'd ask about it. Maybe he'll see the thread here and let you know if he can do it for you.

Small world, but no, Craig hasn't done any work for me, but he does do a lot of AR's and M14's. He showed me his Police model 700 308 a couple weeks ago, he's been healing up from knee surgery here the last few months, still competing tho! He has my gunsmith, Dave Caboth, do some things for him when it pays to. He needed to have Dave mill something for him, I forget what, Craig doesn't have a mill, and I told him he'd probably let him do it himself if he asked him. Dave caught a broken drill bit in the eye last month, so he's havin a rough go of it right now. There talkin like he'll need a lens transplant, but they won't know for sure for a year I guess. That's wait's gotta suck.
Brent Moffitt
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Old 11-29-2003, 09:10 AM
Gold Member
Join Date: May 2001
Location: Urich, MO
Posts: 838
Re: 338 Cal, What Chamber to use?

I would have to see your action and take a couple of measurements to double check but I'm pretty sure it's do-able. Especially with the RUM's.
Chris Matthews
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Old 11-29-2003, 09:50 AM
Posts: n/a
Re: 338 Cal, What Chamber to use?

Jeff, I like the 338 Lapua myself. I finally got my M-18 action from Prairie Gun Works. They really do great work. My gunsmith should have the rifle finished before New Years.

I just want to comment on your bullet selection. I used the barnes on my last hunt with my 7STW. They do drop the animals in their tracks, but the groups were far from good. I passed up a 330 yard shot (like you said - a chipshot!) on a beautiful antelope because the groups are so inconsistent. One day they group 1" @ 100yards, then 4" fliers. I now use 156 Cauterucios with my 7STW and they shoot about 1/2". Good enough for my needs with that rifle.

With the 338 Lapua I'm debating between the 225 nosler accubond and the 300 SMK. I only shoot out to 500 Yards so the AB's will do it for me. But that Lapua is such an accurate round I may opt for the 300SMK so I can get those 1/4" groups. I know with that kind of accuracy I'll be extending my 500 yard limit soon enough and I'm a 1 Load/1 Gun type guy.

So, my point to you is....
If you do go with an accurate caliber like the 338 Lapua, why lose it with the barnes X?

I'll add this, if Bob cauterucio made a 338 VLD, decision time would be over for me!
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Old 11-29-2003, 01:11 PM
Posts: n/a
Re: 338 Cal, What Chamber to use?

Jeff, If my gun consistently shot the barnes-X with good results I would use it too. Just remember, a lot of guns do not shoot them well. If you get your lapua to shoot them well then you have a homerun. I will definitely attest to the killing power of these bullets. The guides on my Mulie & Antelope hunt were amazed how the animals dropped in their tracks. I hear they will be making the new triple shocks in 338 soon.

I have been searching for results for the 225 accubond but so far no one has posted any results on paper or game.

The 225's also intergrate real nice with the NP-R2 reticle on the nightforce scope.

Good luck with whatever you end up using.
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Old 11-30-2003, 12:39 AM
Silver Member
Join Date: Nov 2003
Location: La Grange, TX
Posts: 222
Re: 338 Cal, What Chamber to use?


Send me an email with contact info



Appreciate the thoughts. I happen to have very good luck with flat base X bullets. And they expand down to very slow speeds. And they shed the petals and penetrate like crazy as needed.

I have read lots of thoughts on bullets and be assured that I'm taking that into account. I target shoot a lot and am still scared of all the MK bullets used. I see so many of them in the impact areas that have zero expansion at all. I'd rather not go that route at the moment.

Plus, as noted, the performance of the X at 802 yards for 2 shots on my caribou was superb. Neither stayed in the animal and the second broke the spine. Lots of internal damage. Which leads me to think if I'd have goofed and hit the shoulder I'd have still had the energy to kill.

But, like I said, I'm always open for new thoughts and certainly folks luck with all the other bullets is good news.

In the end maybe a 338 heavy bullet is good enough without expansion.

Thanks for your time.

Get as close as you can, but utilize your skills as needed.
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Old 12-10-2003, 02:28 PM
Junior Member
Join Date: Jul 2003
Location: Alabama
Posts: 8
Re: 338 Cal, What Chamber to use?

I have built many of the big 338's. Yes you can easily open the 300 wby bolt face in a mk v. You also must get the 378 magazine box, etc. I have built several 338-378's and various improved Lapua's off the action. Like someone else said, the best without modifying the action would be using the ultramag case which has no belt. If you opened the bolt face then one of the Rigby or Lapua improved versions would be the best choice if you don't want a belt. The 338-378 wby or the rigby would be the fastest with the 338-300 ultra and the lapua being a bit slower with virtually identical velocities.

I disagree with an earlier post. I have never seen a lapua that could shoot faster than one based off either the 378 or rigby case. Those two are the supreme velocity rounds. I own about four off the lapua case and like them very much. They have some great attributes but are not the fastest. I think I have six 338-378's, four lapuas and seven off the ultramag case all in 338 caliber. All of these are within a couple hundred fps of each other so no big difference either way. Then I have several of these same cases necked to 358. And then a few more still in 30, 8mm and 375.

I learned long ago in my hunting career that there is a reason they use big calibers in Africa. They work best on big game! That is why I have plenty of them.
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