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A bit of load testing .308 win

 
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  #1  
Old 02-18-2010, 01:30 PM
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Join Date: May 2007
Location: Cornwall UK
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A bit of load testing .308 win

Edit:...The Rifle used was my Sako TRG 22 .308win


Went to the range today with Dave aka.. `onehole`( not a member on here though) to do a bit of load testing.
I had made up my usual load of 155 Amax over 44 grns Varget in Lapua brass with a BR2 primer.

I had two lots of loads , same components but 2x different seating depths to test.

20 rounds loaded to SAAMI length of 2.810. Av velocity 2720fps
30 rounds loaded to 0.015 off the lands. Av velocity 2737

My old Musgrave chambered in 7.62 loved to be loaded at 2.810 so i was eager to test my TRG at the same length and also loaded 0.015 thou off the lands.

I think the test target tells a few stories...
As i also tested the velocity and `ES-extreme spread` from both loads
I am now wondering what you guys think would be the best load to test at longer range.

I am aware this is a `light` load for the .308/ 155 Amax but it is supremely accurate @100m

A...The 0.015 off the lands load, that shoots the tightest groups at 100m with an ES of 60 fps..or

B... the SAAMI load that gave bigger groups at 100m ,but gave an ES of 26fps .?

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Martin,
Cornwall. United Kingdom.


Last edited by Varmartin; 02-18-2010 at 02:07 PM.
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  #2  
Old 02-18-2010, 01:48 PM
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Location: McLean, Virginia
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Re: A bit of load testing .308 win

Interesting results. From what I've tested with my 208gr and 178gr A-maxs, they like being close to the lands, im stilling tweaking the depth on my 208s but they seem to like about 5 thou off. A lot like Berger VLDs.

Try loading some heavier charges to see if that brings down your ES. 26 is the upper edge of an OK spread IMO, once you get over 25, the load isnt too good for LR hunting, where you have about a 10-20" target (depending on the animal).

Your ES may be caused by having too much empty space in your casings, how long were your "15 thou off the lands" loads? if they are significantly longer than the SAAMI case, that could explain it. Sort of like powder bridging but much less extreme, just causing non-uniform burning from case to case.

But looks like you got a shooter, very nice repeatable groups, now just need to cut a few fps off the ES and your good to go.

Oliver
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Old 02-18-2010, 02:19 PM
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Location: Cornwall UK
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Re: A bit of load testing .308 win

Oliver, Thanks for your prompt post.

The COL was 2.280 to the ogive.

So 0.070` longer than SAAMI length. thus the extra space in the case as you said requires filling ..which is a good thing because as we have discused in another thread , I am looking for a higher velocity load any how...

My other rifle chambered in 6MM BR Norma likes to be run hot, with a case full of R15 or Varget depending on bullet....and those cases are possably 102% full..and the ES from those loads is usually less than 10 fps...

I have found `crunching` a few kernels works most of the time.

So it looks like i need to stoke the boiler in my .308 cases ....
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Old 02-18-2010, 02:26 PM
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Re: A bit of load testing .308 win

The never-ending dilema… nice groups. (where is 2.810 from lands?, is the brass fire-formed?).

I would make 6 of each again, if you can improve on the ES.. if not, take both out further.. check SD.
Ps. Have you tried another primer?
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  #5  
Old 02-18-2010, 02:40 PM
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Re: A bit of load testing .308 win

2.810 is 0.110` from the lands, brass is 2x fired Lapua


Failed to getthe SD from the crono before it was packed away ,but did write down the velocities as i went ...

SAAMI load 2.810 to bullet tip
2721
2709
2737
2716
2720
2712
2730
2722
2705
2758

0.015 off the lands @ 2.280 to the ogive

2723
2738
2742
2717
2766
2717
2725
2749
2752
2738
2775
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Cornwall. United Kingdom.


Last edited by Varmartin; 02-18-2010 at 02:57 PM.
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  #6  
Old 02-18-2010, 04:14 PM
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Re: A bit of load testing .308 win

Hodgdon list a similar 155-gr projectile at max 47.0-gr Varget at 2909 fps (compressed load). For long range in this cal you will appreciate more powder.. increase charge as possible, and seat dept .010” from lands,checking for pressure spikes- and test some at .030” off. Some rifles like some “jump”. Looks like a good start ..
Then move out.
Good luck
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  #7  
Old 02-18-2010, 05:09 PM
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Re: A bit of load testing .308 win

Thanks for all the good info guys..most appreciated ..

ps. forgot to add last time...yes i have tried another primer ..Fed gold medal match, same results but changed to the BR2 as I thought the harder cup might help with pressure as I increase the load from 46 grns.+
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Last edited by Varmartin; 02-18-2010 at 05:18 PM.
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