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338 Lapua Ackley Improved Load Help

 
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  #1  
Old 04-24-2010, 01:11 PM
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338 Lapua Ackley Improved Load Help

Hi,

I will be converting my 338LM to a Ackley Improved 40 degree shoulder. The barrel is a Lilja, 30" 1-10 Twist, #8 Contour. I think that H1000 or Retumbo are good choices but would like to hear what you gents have to say. Plan on sticking with the 300 smk's.
Need info like, Primers, Charge weight, how far off the lands, etc. Thanks in advance.

Ray
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Old 04-25-2010, 08:56 AM
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Re: 338 Lapua Ackley Improved Load Help

I shoot 110gr of US869 out of mine. 30" Brux and I get 3030fps with 300gr MK. I use Federal Match primers and load the bullets 10thou off the lands.
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Old 04-25-2010, 11:22 AM
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Re: 338 Lapua Ackley Improved Load Help

Wow, that is very impressive! I doubt that I will achive that out of a Lilja Barrel as they seem to have a tighter bore than most.
My 338 Lapua was getting 2725fps when new. After a couple hundred round, it jumped to 2750fps, 90gn. H1000. I would be happy with these same numbers in the 2900's.
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Old 04-25-2010, 11:47 AM
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Re: 338 Lapua Ackley Improved Load Help

Quote:
Originally Posted by 6mm Shooter View Post
I shoot 110gr of US869 out of mine. 30" Brux and I get 3030fps with 300gr MK. I use Federal Match primers and load the bullets 10thou off the lands.
How do you like the 40 degree shoulder?
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Old 04-25-2010, 12:04 PM
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Re: 338 Lapua Ackley Improved Load Help

Quote:
Originally Posted by 6mm Shooter View Post
I shoot 110gr of US869 out of mine. 30" Brux and I get 3030fps with 300gr MK. I use Federal Match primers and load the bullets 10thou off the lands.
Hi 6mm,

How many loads do you figure you'll get out of those cases?

How's the accuracy at longer ranges?

Have you tried that load over a wide range of temps? Curious how 869 would do in that chambering with that bullet over a wider range of temps. My experience with it in the 300RUM shooting 240's was that it was pretty temp sensitive. But it seems some are getting very good velocities with it. I know 'long ranger' up in Canada ( Alberta Tactical Rifle Supply ) shoots just a bit stiffer load than that and has many, many firings on the same cases.
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  #6  
Old 04-25-2010, 12:22 PM
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Re: 338 Lapua Ackley Improved Load Help

jwp475,

Do you have experience with something other than a 40 degree shoulder?

I too am interested in US869. I would like to stick with a powder that temp insensitive, this why I asked about Retumbo and H1000.
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  #7  
Old 04-25-2010, 12:38 PM
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Re: 338 Lapua Ackley Improved Load Help

I have only shot the 300 SMK's in the fireforming loads and I am using 94 gr Retumbo loaded at 3.710 OAL which is .010 off the lands.
I know alot of people who fireform with the bullet in the lands but this worked out for me as a very accurate usable load. 3 shots in 1/4"at 100yds.

I never shot the 300 SMK's in fireformed brass but am going to do that in the next month or so.
I just ordered 500 of them from Midway and should get them next week.

So far in fireforming, Retumbo showed more accuracy than US869 for my rifle. But I haven't given it a very extensive test yet.

I have a buddy with a 7MMRUM who uses US 869 and it has been the best powder by far in that cartridge. I too am interested in building a 7RUM.
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