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338 Lapua...loads...info etc.

 
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  #8  
Old 07-03-2002, 11:32 PM
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Join Date: Nov 2001
Location: Sydney Australia
Posts: 40
Re: 338 Lapua...loads...info etc.

Brian,

Thanks for that.

I think the 338 Lapua is much easier thing to do than the 33/404 if you are happy to go with either CZ or Wby Mark V.

The interesting thing with the Mark V is that they do not use the actions rails for feeding so with maagzine box and follower you could swap around between the H&H case, 404 case and Rigby/378 case.

I will get a chance soon to see if 300 Ultra will feed from the inline magazine of a 416 Wby and I am betting they will.

With a bit of work on the extractor and how it rests on the bolt I suspect you could use the dame bolt for both the 404 case head and Rigby/Lapua/378 case head.

We poor people have to imporovise [img]images/icons/grin.gif[/img]

Mike
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  #9  
Old 07-12-2002, 06:28 AM
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Join Date: Oct 2001
Location: Altus, OK
Posts: 180
Re: 338 Lapua...loads...info etc.

Mike375,

I have a 338 Lapua and a 330 Dakota and just sold a 338 RUM.

I have gotten 3000fps from a 250 and 3500 from a 180 from the Lapua. I never chrono'd the Rum. In the Dakota, I have gotten 2875 from a 250. What other infromation are you looking for?

Jim
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  #10  
Old 07-13-2002, 11:13 PM
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Join Date: Jul 2002
Location: Sitka, AK
Posts: 12
Re: 338 Lapua...loads...info etc.

338Lapua,

Do you have any velocities with 210gr Barnes X bullets, in any of those .338's?

Thanks

BW
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  #11  
Old 07-14-2002, 08:16 AM
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Join Date: May 2001
Location: NC
Posts: 352
Re: 338 Lapua...loads...info etc.

Brian,
In regard to your listing of H2O water capacity, the 338 Lapua (which I assume is a std 338 Lapua??) is way off. A std 338 Lapua is very close to the 338 RUM at 113gr of H2O. I shoot a 338 Yogi (Dave Tooleys version of a 338 Lapua Improved) and I get 120.6gr of H2O on that so the parent case can't be bigger. I've measured the 338 RUM, std 338 Lapua, my 338 Yogi, and 338/378 cases personally and I agree with your numbers for these cases except of the 338 Lapua. It's almost neck in neck to the RUM case right around the 113+gr H2O capacity area.

FYI: Lapua brand 338 brass has about 1gr more water capacity over Norma brand 338 Lapua brass.

Steve

[ 07-14-2002: Message edited by: Steve Shelp ]
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  #12  
Old 07-15-2002, 02:55 AM
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Join Date: Jul 2002
Location: Sitka, AK
Posts: 12
Re: 338 Lapua...loads...info etc.

Steve,

That would explain a few things. [img]images/icons/smile.gif[/img] Most notably, the lack of extra velocity out of the Lapua version as compared to the RUM.

My data came from a relatively new reloading software program. To be fair, the version I have is a "beta" version, and the data may be correct in the final version. I'll e-mail the program writer and let him know.

Thanks again.

BW
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  #13  
Old 07-15-2002, 03:44 AM
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Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: 338 Lapua...loads...info etc.

So Steve, what would you guess a 338 RUM's capacity would be if using the full length 300 RUM case and necking down to be? More than the Lapua, but not as much as the Yogi that has the good brass? My father is considering the 338 RUM Imp. for a LH Rem 700 action I have.
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  #14  
Old 07-15-2002, 08:12 AM
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Join Date: May 2001
Location: NC
Posts: 352
Re: 338 Lapua...loads...info etc.

Brian,
No problem. Good luck with your program and whatever caliber you decide to build.

Brent,
How's it going? Sure hope your over your M1A experience ok. That was scary!! anyway without having actually measured a 300 RUM myself, I would have to say based on the known outside dimensions of that case, that would be a pretty fair assumption to say it would be right in between the 2. Should make a nice hunting rifle..... especially in a lefty version! A rifle built the "right" way.

Steve
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