Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

338 Lapua Velocities

 
LinkBack Thread Tools Display Modes
  #1  
Old 08-10-2009, 10:00 PM
Silver Member
 
Join Date: Oct 2005
Posts: 122
338 Lapua Velocities

What are u guys getting on average out of your rigs. I am doing 3150 or so with 250s and around 3300 to 3340 with 225s, does that sound about right. This is with a 25 inch bbl, 10 twist and with several guns. RL25 is my powder btw.
Reply With Quote
  #2  
Old 08-10-2009, 10:20 PM
Official LRH Sponsor
 
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,831
Re: 338 Lapua Velocities

That seems pretty high for a 25" barrel length. The Lapua case can take some serious pressure. What load are you using to get those velocities. Not saying your over pressured, just above average in my opinion.

I generally see around 3050-3075 with the 250s.
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
Reply With Quote
  #3  
Old 08-10-2009, 11:13 PM
Platinum Member
 
Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: 338 Lapua Velocities

I use winchester wmr in mine and get 5-8 fps extreme vel spreads. The 200 AB tops out at 3400 fps and the 250 AB tops out at 3125 fps. These are the two I have with 26" barrels. Virually identical to my 338-300 ultramags with 28" barrels and about 75 fps faster than my 340 Weatherby with a 28" barrel.
__________________
Predictions are difficult, especially when they involve the future
Reply With Quote
  #4  
Old 08-11-2009, 12:14 AM
Silver Member
 
Join Date: May 2003
Location: AK
Posts: 157
Re: 338 Lapua Velocities

Quote:
Originally Posted by Long Time Long Ranger View Post
I use winchester wmr in mine and get 5-8 fps extreme vel spreads. The 200 AB tops out at 3400 fps and the 250 AB tops out at 3125 fps. These are the two I have with 26" barrels. Virually identical to my 338-300 ultramags with 28" barrels and about 75 fps faster than my 340 Weatherby with a 28" barrel.

Wondering if your rifles all share the same receiver-magazine oal, LTLR?

How much better performance can/could you obtain if you were seating your bullets in the smaller capacity cases to the same oal your .338LM allows? Have you looked at the .338 Norma which is supposed to be in the same ballpark as all others you mention, including the LM and 338-378; but being several tenths shorter enable optimum seating flexibilty?

With the super-mag cases, you lose much seating variability, unless your receiver has a 4" magazine oal. The Sako TRG42 or TRG-S with M995 action has 3.75". I'm not familiar with Lawton or Stiller super-mag sized actions but how many are using them with anything but the largest cartridges anyway? Ultra Mag and 340 Weatherby are all standard magnum functional.

My point is without having to stuff half the bullet below the case neck, likely you would get same neighborhood performance as the lapua and do so while burning less powder or using those with less than slowest burn rates.

Just happen to have the Accurate Arms #2 by the desk and it shows in a .338RUM that a 250gr Grand Slam driven by 79gr of xmr4350 yields almost 2800fps, while same bullet w/104gr of their 8700 yields 25fps LESS! Not debating that there aren't more energy producing powders, but if you had an extra .25" (or more) to move the bullet forward, freeing up additional capacity, should be able to boost those velocities.

The same load of xmr4350 in the .340wby yields the same velocity as the .338rum according to AA, but at only 61000psi. With another .15" of seating depth and throat optimized for it, in the .340wby, and going up to 65kpsi you could be in the same ballpark as the Lapua but with 20gr less powder...

Just some thoughts.

Now I will shamelessly plug the .338/300 win mag which I've embraced because it allows more flexibility than any large magnum. From 65gr of xmr4350 to 79gr with a 250gr bullet; plus oal case length of 2.62" which allows seating your bullet almost flush with the neck. About the same performance as the .340wby, but with wider variety of brass and lower expense.

I understand about Lapua brass, and they no longer make win mag brass, but in a 14lb field rifle such as a .338/300 win TRG42 you won't "need" a brake. With more mid-sized ctg case you don't need the 28-30" barrel to burn all that slowest burning powder.

Of course the .338LM really needs a 4" minimum oal magazine to get all its horsepower and torque working for you. Yet, those actions are really heavy, or I would expect them to be, and the military shoot factory loads to specs anyway so the magazine oal is not valued.

Custom rifles, chambers, wildcats and handloading variables are what this a most fascinating pursuit. When it comes to the power element of highpower rifles, nothing can do as much as a .338 bullet.
Reply With Quote
  #5  
Old 08-11-2009, 10:58 AM
Silver Member
 
Join Date: Oct 2005
Posts: 122
Re: 338 Lapua Velocities

Sorry on the 25 inch bbl, should have said 26 inch bbl. Using rl25 for the most part, seemes to put out the most for me. I am around 3.78 oal btw. This is not a one shot deal btw, these are all reloadable. Just filled up a lapua case last night with H870 and gor 116 to the top of mouth. Some have stated quicklaod calls for a water cap. of 108, don't get that one.
Reply With Quote
  #6  
Old 08-11-2009, 12:45 PM
Official LRH Sponsor
 
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,831
Re: 338 Lapua Velocities

Casscade,

Do not go on primer pocket tightness as a judgment of pressure when using the lapua case. The Lapua 338 case will take 65 to 68,000 psi all day long and never show any sign of primer pocket loosening.

Believe me, I have pushed this case developing all of my wildcats based on it and can say I have yet to really loosen a primer pocket on one of these cases. If you do see any primer pocket loosening, your WAY over pressured.

Again, primer pocket tightness is just not a good indicator of pressure with the Lapua case.
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
Reply With Quote
  #7  
Old 08-11-2009, 01:51 PM
Silver Member
 
Join Date: Oct 2005
Posts: 122
Re: 338 Lapua Velocities

Kirby whats the average u have been getting(338lapua) and whats the best sign to look for preassure wise in the lapua brass. Also is the Lazz titan much if any faster than the lapua. Thanks.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: 338 Lapua Velocities
Thread Thread Starter Forum Replies Last Post
6.5x47 Lapua velocities petenz Rifles, Bullets, Barrels & Ballistics 3 01-18-2009 07:55 PM
338 Lapua Velocities? 300WSMMAD Rifles, Bullets, Barrels & Ballistics 8 08-08-2008 05:51 PM
6mm br velocities Kevin Rifles, Bullets, Barrels & Ballistics 7 12-15-2003 01:16 AM
338 Lapua velocities Nicholas Rifles, Bullets, Barrels & Ballistics 7 05-29-2003 02:17 PM
6.5-284 velocities 10X Rifles, Bullets, Barrels & Ballistics 10 10-24-2001 06:13 AM


All times are GMT -5. The time now is 04:02 AM.


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