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338 lapua MV

 
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  #8  
Old 11-01-2011, 08:52 PM
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Join Date: Jul 2011
Location: manitoba, canada
Posts: 84
Re: 338 lapua MV

Hey Bryan,

In my 110ba:

300 gr Sierra mk
89.2 gr retumbo
Oal 3.702"
2755 fps
(shooting very well out to 1000yrds)

300 gr Berger hybrid
89.2 gr retumbo
Oal 3.758"
2700 fps
(just started tinkering with this bullet... Reduced speed compared to smk likely because I had to load a lot further off the lands to fit the magazine)

285 gr hornady hpbt match
91.4 gr retumbo
Can't remember oal off hand
2822 fps
(showing very good potential at 1000 and actually doesn't give up much to the Berger hybrid as far as drop at distance and both those edge out the SMK at the velocities I have them loaded at according to my ballistic software... Keep in mind that is just what the software says, I haven't sent as many of the hornady and Bergers to 1000 as the SMK's so I can't confirm what the software says )

Orch
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  #9  
Old 11-01-2011, 09:40 PM
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Join Date: Oct 2007
Posts: 901
Re: 338 lapua MV

How, exactly, do you know you will be shooting 92 gr of H1000? Now, to be fair, a guy can be fairly close. For me and the 7mm Rem Mag......71-74 of h1000 and a 150 NBT....but that is still a four grain spread. I can go as far as to ALMOST garitee the powder, but to predict the actual charge wt........NOT!!
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  #10  
Old 11-01-2011, 10:14 PM
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Join Date: Aug 2011
Location: Sioux Lookout, Ontario
Posts: 46
Re: 338 lapua MV

I have a 110BA as well and i'm loading 91.0gn H1000 and am getting 2820 FPS out of it.

91.0gn H1000
300gn SMK
Lapua Brass
3.706 OAL .030 off lands


It seems the sweet spot with this rifle is around the 2800 fps mark with the 300 smk's. I also see orch is using 3.702 as an OAL so the sweet spot must be around the .030 mark as well.
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  #11  
Old 11-04-2011, 02:47 PM
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Join Date: Feb 2011
Location: Prince George B.C.
Posts: 195
Re: 338 lapua MV

Quote:
Originally Posted by 4xforfun View Post
How, exactly, do you know you will be shooting 92 gr of H1000? Now, to be fair, a guy can be fairly close. For me and the 7mm Rem Mag......71-74 of h1000 and a 150 NBT....but that is still a four grain spread. I can go as far as to ALMOST garitee the powder, but to predict the actual charge wt........NOT!!
Because that was the starting load I had decided on after doing a lot of reading on what was working in other peoples guns rather than just a number I pulled out of thin air. I did use 92 grains but dropped it down to 91 because I was getting craterd primers and 91 was more accurate and consistant anyways. My question was whether or not that stated velocity seemed right or not, and judging by what others have posted on here it isn't right which is what I had wanted to know.
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  #12  
Old 11-04-2011, 02:58 PM
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Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 7,934
Re: 338 lapua MV

With a 26" tube 1 in 9 twist, 91 gr of H-1000 and a 300 SMK should be in the 2725 to 2750 range. That is my best guess after firing well over 1000 rounds all with H-1000 and 300 gr bullets from a .338 LM.

Jeff
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  #13  
Old 11-04-2011, 03:24 PM
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Join Date: Feb 2011
Location: Prince George B.C.
Posts: 195
Re: 338 lapua MV

Many thanks to all for posting their recipes and actual velocities. I have used up my supply of SMK's and am about to start playing with the 300 bergers, gen 1's as well as 2's. After some testing I will post my results. Once again thanks everyone for your input.
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  #14  
Old 11-04-2011, 04:18 PM
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Join Date: Jul 2010
Posts: 420
Re: 338 lapua MV

I think I am the last hold out in my area to still be shooting the LM. Most everyone went back to the 338-378. The 338 LM has some very good attributes but velocity is not one of them. A long time ago I learned not to use Vihtavuori powders or Scenar bullets in them and that the higher velocities of other cartridges is not an actual improvement.
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