Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Hunting > Long Range Hunting & Shooting

Long Range Hunting & Shooting Nightforce Optics


Reply

338 Lapua Mag or 338 RUM

 
LinkBack Thread Tools Display Modes
  #1  
Old 11-15-2010, 11:38 AM
Bronze Member
 
Join Date: Jul 2009
Posts: 59
338 Lapua Mag or 338 RUM

Well Ive decided to do another build and was wanting something in a 338 caliber. I cant decide between the 338 Lapua or the 338 RUM. I know the brass will be cheaper for the RUM but Ive heard that the 338 Lapua mag is more accurate. Please help me decide.
Reply With Quote
  #2  
Old 11-15-2010, 11:57 AM
Platinum Member
 
Join Date: Nov 2008
Location: Central Pennsylvania
Posts: 4,022
Re: 338 Lapua Mag or 338 RUM

6 of one, and half dozen of the other really. They use pretty much the same amount of powder. Both can be made to be very accurate. So I would say your safe either direction. I shoot a Lapua occasionally and feel due to the brass quality, you can get a little edge toward velocity verses the RUM. But head to head you really shouldn't see much difference.

Tank
__________________
Matthew 7:13-14
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

Friends don't let friends develop canonitis!-chucknbach

arguing over the internet is like the special Olympics....even if you win, you are still...special!
Reply With Quote
  #3  
Old 11-15-2010, 12:56 PM
B23 B23 is offline
Gold Member
 
Join Date: Oct 2008
Location: Spokane, Wa.
Posts: 930
Re: 338 Lapua Mag or 338 RUM

I'm no pro, just your average joe shooter so take this for what you will.

I don't think one is anymore or less accurate than the other. BUT, if you are going custom anyway, I would never do a 338 Lapua that wasn't one of the "improved" versions. IMO, an improved 338 Lapua is well worth any extra fuss you may think it involves.

If you have Kirby Allen build you one of his 338AX you not only get your dies with the build but you can buy fireformed 338AX (338 Lapua improved) brass from him. If you want to fireform your own that works too because the standard 338Lapua loads will easily shoot M.O.A. they just won't be quite as fast.

For me, a 338 Lapua Improved would be a no brainer and kinda the best of both worlds because it would still shoot factory 338 Lapua ammo very well.
Reply With Quote
  #4  
Old 11-15-2010, 02:48 PM
Platinum Member
 
Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: 338 Lapua Mag or 338 RUM

Both are equally accurate. I just pulled up data for two 338 RUM's and two 338 Lapuas with 30" barrels that I built and tested at my shop. All four had excellent accuracy to about 2830 fps with the 300 smk (varied slightly between guns). I have been able to run velocities just a little faster overall with the Lapua probably because the lapua brass would load to higher pressures. But basically the 338 RUM, 338-300 RUM or edge on here and 338 Lapua are identical in accuracy and performance. Overall if you want to push them to the max I have been able to get just a little more velocity out of the 338 Lapua than the other two probably because the Lapua brass will take higher pressures. 90% of these are going to max out with best accuracy between 2750-2850 fps.

The Lapua may be more expensive to build because of the action it requires and will be more expensive to shoot with the brass. I agree with others that I would consider the 338 Lapua imp at the minimum if you are doing a custom action. The ultramags are great if you have a donor standard magnum action to save some cash but if you are going custom then look for more bang for your buck. Improved versions of the 338-378 wby case and A'square's 338 Excalibur can give you 200-300 fps over the standard Lapua and ultramag based cartridges easily pushing the 300 smk well over 3000 fps. All are accurate and fun to shoot. A 300 smk at 3100 fps is way fun to shoot at extreme long range over 1000 yards.
__________________
Predictions are difficult, especially when they involve the future
Reply With Quote
  #5  
Old 11-15-2010, 02:50 PM
GNERGY
 
Posts: n/a
Re: 338 Lapua Mag or 338 RUM

I went with the 338 Ultra mag and have had real good results.
read this

338 ULTRA MAG & 225gr. BARNES RESULTS

Tarey
Reply With Quote
  #6  
Old 11-15-2010, 03:05 PM
Bronze Member
 
Join Date: Aug 2008
Posts: 92
Re: 338 Lapua Mag or 338 RUM

Quote:
Originally Posted by B23 View Post
I'm no pro, just your average joe shooter so take this for what you will.

I don't think one is anymore or less accurate than the other. BUT, if you are going custom anyway, I would never do a 338 Lapua that wasn't one of the "improved" versions. IMO, an improved 338 Lapua is well worth any extra fuss you may think it involves.

If you have Kirby Allen build you one of his 338AX you not only get your dies with the build but you can buy fireformed 338AX (338 Lapua improved) brass from him. If you want to fireform your own that works too because the standard 338Lapua loads will easily shoot M.O.A. they just won't be quite as fast.

For me, a 338 Lapua Improved would be a no brainer and kinda the best of both worlds because it would still shoot factory 338 Lapua ammo very well.
I agree with B23 and I put my money where my mouth is . I am getting real close to receiving my 338AX from Kirby. Never really considered the 338 Rum. For me its the 338 Edge over the Rum in a Custom build. Nothing wrong with the 338 Rum its just the 338 Edge is better in every way IMO. The quality of brass for the 338 Lapua puts it at the top of my list improved or not. Accuracy will be to close to tell if you use a good Smith.

Dan
Reply With Quote
  #7  
Old 11-15-2010, 04:05 PM
Bronze Member
 
Join Date: Aug 2008
Posts: 92
Re: 338 Lapua Mag or 338 RUM

Just wanted to add if you find that building a 338 Lapua/or improved puts you over your budget due to the higher cost of action required for the Lapua sized bolt face, contact Nate at Straight Shot Gunsmithing. He has a Defiance Machine action built to his specs that is super sweet. He uses it on most of his builds. I just decided to have him build me a gun on this action. Its priced right inline with most the actions you would use for a standard magnum build and its top notch. You would be hard pressed to find a better Smith than Nate and he is a great Guy to deal with.

Dan
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 338 Lapua Mag or 338 RUM
Thread Thread Starter Forum Replies Last Post
NORMA 338 Lapua brass VS Lapua ! Hmmmm? 300WSMMAD Rifles, Bullets, Barrels and Ballistics 9 10-09-2012 02:48 PM
What is the difference between Norma and Lapua 338 Lapua Magnum brass? jhegg Reloading 8 05-22-2012 12:12 AM
***WTS--Lapua 338 Lapua Brass**100 Peices NEW*** jcvibby Reloading Equipment and Components 2 08-21-2011 10:02 AM
sako trg-42 338 lapua vs McMillan MCRT .338 Lapua Tactical kidcoltoutlaw Equipment Discussions 9 07-16-2009 09:45 AM
WTS: 125 .338 Lapua (Lapua Brand) Once Fired Brass... *** SOLD *** Bronson90 Guns For Sale 1 08-07-2004 01:53 PM

Current Poll
Do you watch outdoor shows live or by recording them?
Always recorded - 13.33%
109 Votes
Mostly recorded - 24.21%
198 Votes
Sometimes recorded - 14.18%
116 Votes
Rarely or never recorded - 48.29%
395 Votes
Total Votes: 818
You may not vote on this poll.

All times are GMT -5. The time now is 08:46 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC