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Working Up Loads For The 338 Lapua

 
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  #1  
Old 07-06-2008, 01:15 AM
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Working Up Loads For The 338 Lapua

I just recieved my 338 Lapua that I had built on a Rem 700 action, with an ABS carbon wrap barrel that is 31" long including the brake, set up with a Seekins Detachable box magazines to take a 3.9" COAL, set in a Rem. Sendero stock. I originaly wanted to shoot the 325 grain Wildcat rebated boatail bullet, but it will not stabilize in the 10 twist of my barrel. They were key holeing even with velocity over 2700 FPS. Today I tried some 250 grain SMK bullets with 98 grains of H-1000 they averaged 3189 FPS with a SD of 11 FPS and 95 grains of Reloader-25 averaged 3197 FPS with a SD of 9. I also tried 98 grains of Retumbo and this load averaged 3010 FPS but seemed a little mild in the pressure department and di not shoot nearly as acurately as the other 2 powders did.

Next I moved back to shoot a group with both loads to 330 yards according to my lazer range finder. I only had 2 of the H-1000 loads and the 2 shots went .634 inchs. The 95 grain load of Reloader-25 with 3 shots went into a group of 1.125 inchs with the first 2 into .424 inchs

I was very pleased with this performance both in the velocity and accuracy. Tomorow I am going to shoot some more with the H-1000 load.
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Last edited by jwp475; 07-06-2008 at 07:46 AM.
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Old 07-06-2008, 07:40 AM
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The 325 Wildcat bullet may take a longer range to stabilize.

I'm loading 92.5gr/H1000 using the 250gr Scenar and LockBase.

I've tried RL22, RL25, but not Retumbo.

The Nosler 225gr Accubond is accurate as is the Hornady Custom Ammo with their 250gr bullet.
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  #3  
Old 07-06-2008, 11:18 AM
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We found the RL line of powders to be finnicky with respect to humidity and temperature. H1000 and Retumbo work fine for us. Too bad the 325 Wildcat would not stabilize at your location.

Try some of the Henson bullets as they have all been stable at 100 yards at 92ft above sea leavel. Bullett33@hotmail.com

James

Last edited by Lightvarmint; 07-06-2008 at 11:27 AM.
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Old 07-06-2008, 12:12 PM
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Which wieght, the 265?
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  #5  
Old 07-06-2008, 01:22 PM
Lightvarmint
 
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Quote:
Originally Posted by jwp475 View Post
Which wieght, the 265?
Both the 280 grains and 265 grains work in our 10" twist barrels. The 280 was at 3100 and the 265 was 3200.

James
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Old 07-08-2008, 09:04 PM
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If you can find any Winchester WMR it is extremely accurate in the 338 Lapua. They quit making it and I don't know where to find it now. I loaded up on it when they quit making it. It was the most accurate in my 338 Lapuas and several others who shot it around the country.
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Old 07-10-2008, 08:42 PM
Lightvarmint
 
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Quote:
Originally Posted by Long Time Long Ranger View Post
If you can find any Winchester WMR it is extremely accurate in the 338 Lapua. They quit making it and I don't know where to find it now. I loaded up on it when they quit making it. It was the most accurate in my 338 Lapuas and several others who shot it around the country.
Hello,

Mr Henson has about 32lbs of the stuff and he swears by it.

James
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