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338 lapua AI 40 degree load help

 
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  #1  
Old 10-08-2013, 05:22 PM
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338 lapua AI 40 degree load help

Fireforming loads with 92 grains of H1000 and 300 smk shot into less than 1" at 300 yards at 2700 fps

Using the formed brass I am strugling to stay at 3/4 moa.

using the area of 96-98 grains of H1000 and velocity in a 29" barrel is around 2800fps. like I said accuracy is sub-par.

Is there a higher pressure node I should be in? not sure how high I should go.

loaded up 104 grains of Retumbo today and will give that a go tommorow.

any advice?
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  #2  
Old 10-08-2013, 05:30 PM
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Re: 338 lapua AI 40 degree load help

Jim I think you need to go higher. I have run 92.5 gr of H1000 with 300 SMKs in my standard Lapua. You should get close to 2950 with H-1000 from the AI. 100 gr of VV N-570 will get you close to 3000.


One more thing. 90% of the .338's I have done will take a 3/4" load at 100 yds and print the same 3/4" group at 300 yds.

I don't spend much time at 100 yards with a 338 and a 300 Berger or a 300 SMK.

Jeff
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  #3  
Old 10-08-2013, 07:57 PM
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Re: 338 lapua AI 40 degree load help

Thanks Jeff, Since my move I am limited on a longer range to shoot at. having 600 yards outside my back-door spoiled me.

I will shoot them at 300, I have a spot to confirm trajectory at 1100 but it takes a few phone calls to get in. The only bergers i have is the original 300 OTM that i picked up when they first came out. I will shoot the Retumbo load and work it up again if this trial doesn't perform.

Elk hunt in less than 2 weeks and I'm cutting it close.
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Old 10-08-2013, 08:34 PM
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Re: 338 lapua AI 40 degree load help

Quote:
Originally Posted by Jim See View Post
Thanks Jeff, Since my move I am limited on a longer range to shoot at. having 600 yards outside my back-door spoiled me.

I will shoot them at 300, I have a spot to confirm trajectory at 1100 but it takes a few phone calls to get in. The only bergers i have is the original 300 OTM that i picked up when they first came out. I will shoot the Retumbo load and work it up again if this trial doesn't perform.

Elk hunt in less than 2 weeks and I'm cutting it close.
Jim, just stick with the SMk's. I think you would be on the edge of the Gen 1 Berger 300's coming apart. You should get a good load with Retumbo and the 300 SMK. Just watch for the Retumbo spikes. Probably won't be an issue with the AI and fall temps. .065" off lands was a sweet spot for me with the SMK. And they liked a max load.

Jeff
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Old 10-11-2013, 09:24 PM
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Re: 338 lapua AI 40 degree load help

Jeff, I worked up a good load that is running 3009 with 300 OTM, (2nd generation found a couple boxes.) using Retumbo.
I showed some slight ejector marks at 3060 so backed down a grain and a half. test shot 1" verticle at 300. I'm calling that good for elk ;-)

This weekend I am shooting 600 and 1100 for trajectory validation and going hunting.

Thanks for the help,
Jim
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  #6  
Old 10-11-2013, 11:39 PM
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Re: 338 lapua AI 40 degree load help

Quote:
Originally Posted by Jim See View Post
Jeff, I worked up a good load that is running 3009 with 300 OTM, (2nd generation found a couple boxes.) using Retumbo.
I showed some slight ejector marks at 3060 so backed down a grain and a half. test shot 1" verticle at 300. I'm calling that good for elk ;-)

This weekend I am shooting 600 and 1100 for trajectory validation and going hunting.

Thanks for the help,
Jim
That will work Jim. Glad you got her going, but I knew you would.

Good luck on your hunt.

Jeff
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  #7  
Old 10-14-2013, 10:14 AM
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Re: 338 lapua AI 40 degree load help

dsmmit.. u guys r going to make me build another lapua with those velocities!!!!!!

kasey
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