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338 Edge and 338 Lapua AI numbers

 
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  #1  
Old 09-29-2010, 05:28 PM
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338 Edge and 338 Lapua AI numbers

I'm considering a long range build and am interested in the 338 Edge or the 338 Lapua AI. This will be a dedicated long range hunting rig for large game. I have but one question:What are the velocity and energy figures at 1,500 yards for each round?

Thanks for the info.
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Old 09-29-2010, 10:39 PM
B23 B23 is offline
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Re: 338 Edge and 338 Lapua AI numbers

Since your question is pretty vague other than the 338Edge and 338 Lapua Improved are the two you're looking at the best answer at this point, is the 338Lap. Imp. is going to have MORE of just about everything than the 338Edge.

If you pick a specific bullet and barrel length you will get a much more specific answer.
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Old 09-29-2010, 11:10 PM
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Re: 338 Edge and 338 Lapua AI numbers

My apologies. Given a 300 grain SMK with it's BC and real world velocities from the 338 Lapua AI and 338 Edge, what are the energy figures at 1,500 yards. I ask as I am unclear on the velocities of the 338 Lapua AI and have no experience with the 338 Edge either. I'm hoping that someone with said rifle and a ballistics program can post it.

Another helpful bit of info would be their barrel length.

Thanks again.
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Old 09-29-2010, 11:24 PM
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Re: 338 Edge and 338 Lapua AI numbers

In considering the whole "system" involved with a cold bore precision at 1500 yards, both calibers have capabilities beyond most hunters/shooters.

Since you state this will be a dedicated LR hunting rig for large game...these would be some I wish I would've pondered on a while back on my quest-

1. What range finder do you plan on using that has sufficient beam width divergence to ensure you are ranging the intended target vs. a bush, rock, etc in vicinity of the target at those ranges? At those ranges, given a ISA atmosphere, a range determination error of 5 yards is 6 inches high or low...which could mean the difference between a happy ending to a shot, or the beginning of a long chase.

2. B23 hit on an important point...there are many variants to the 338 Lapua Improved. In fact dare I say that throat design/barrel may account for 100 fps variance between the different designs of the 338 Lapua Magnum Improved. All things considered equal (throat design, barrel length, quick vs. slow barrel, pressure vs. brass life), a maxed out variant of the 338 Lapua Improved will have more case capacity, and will withstand additional pressure before blowing primer pockets than the 338 Edge, allowing it to outpace the Edge by 35-60 fps.

3. Ability to make consistent precision ammunition will come into play at these ranges, so brass quality and availability of "easy for you to make precision ammo dies" should come into play as well when deciding between the two.

4. The initial purchase price advantage of Rem 300 RUM brass vs 338 Lapua brass is just a teaser...don't fool yourself You'll be so far down the rabbit hole money wise with a honest 1500 yard cold bore gun, that would be a insignificant factor in making your decision in my opinion. Once you consider brass life...this further evens the field between the two.

Go to the defensive edge website and review the load data for the 338 Edge.

I have personal experience with a 338 LMAI does 2920 fps with 104 gr of Retumbo out of a 28" barrel with very good precision.

Keep in mind most rifles shoot best short of their full velocity potential....that's why you'll see most Edges run at 2820-2850 fps, 'cause that's where they have shown their best precision potential. Same on the 338 LMAI.

Good luck and remember to keep it fun!

Last edited by Autorotate; 09-30-2010 at 01:20 AM. Reason: Added link for Shawn's website
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Old 09-29-2010, 11:48 PM
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Re: 338 Edge and 338 Lapua AI numbers

Autorotate, thanks for the info. I was not looking for max velcoities but, indeed, real world velocities so as to get maximum accuracy from the weapon and go from there. I see you're in Eagle River. I'm in Peters Creek. What did you end up with in your quest?
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Old 09-30-2010, 12:04 AM
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Re: 338 Edge and 338 Lapua AI numbers

PM sent!
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  #7  
Old 10-01-2010, 02:32 PM
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Re: 338 Edge and 338 Lapua AI numbers

Real world accuracy numbers the better338 lapua ai versions will get you 100-150 fps advantage over the 338-300 ultramag. If you are doing a custom get the 338 lapua AI. I have shot them all.
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