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Please Give Opinion On This Ladder Test (Pics)

 
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  #1  
Old 01-13-2013, 07:48 PM
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Join Date: Nov 2012
Posts: 6
Please Give Opinion On This Ladder Test (Pics)

Hi, Everyone.

I need experienced opinions on this ladder test I ran today since I've never run one before. Any help would be appreciated. Here are the details on the specifics:

Rifle: Savage 110 FCP HS Precision, .338 LM
Load: Lapua brass, CCI 250 primer, Sierra MK 300 gr. bullet, Retumbo powder
Target Distance: 300 yds.
Conditions: 76 deg. F, Winds - Quartering-to-direct tailwind @ 12-13 Kts

I began at the Hodgdon-listed minimum load of 85.0 gr. and progressed in 1.0 gr. increments up to 88.0 gr, then, beginning with load #5 @ 88.5 gr, progressed from there in 0.5 gr. increments all the way up past the book-listed maximum load of 94.0, finally ending on 95.0 gr. No real evidence of excessive pressure was noted except for a slight bit of cratering around the firing pin indentation on the last 2 or 3 rounds (no primer flattening, no ejector marks, no hard bolt lifts, etc. were noted).

I'm not experienced with spotting nodes, but I'll throw out what I think I see on the paper, and ask for your advice on my interpretation. The first potential node I think I see occurs with loads 9, 10, and 12. Oddly, load #11 dropped to the bottom of the paper, and I can only guess I pulled it, but it felt good at the time. MVs for this string are as follows: 9 = 2633, 10 = 2672, 11 = 2663, and 12 = 2683.

The next potential node I think I see occurs with loads 13 and 14. There's a significant hop from 12 to 13, but then 13 and 14 fall within about 1/2 in. of each other vertically. MVs are 13 = 2698, 14 = 2727.

Finally , there appears to be another node @ 17 and 18. Both these loads are above the "book" max of 94.0 gr., with 17 @ 94.5, and 18 @ 95.0. MVs are 17 = 2785, 18 @ 2800. I also found it interesting that the lowest-power loads, and the highest-power loads landed on the same windage plane as the aimpont, while all others in-between landed to the left to varying degrees.

So, what to do with this info? The lowest node (9, 10, 12) falls a little below the MV level that I'd like to achieve, but seems to have some real accuracy potential. The middle node is about where I'd like to run (around 2700), but may not quite have the accuracy potential of the others. And finally, the upper node with the final two shots is potentially impressive, but I wonder if I'd be burning up the barrel and brass at an excessive rate running things that hot?

I'm really looking for advice on my next move. Any advice is much appreciated. I'm also posting this on Sniper's Hide for additional insight. Thanks!

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  #2  
Old 01-13-2013, 08:08 PM
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Join Date: Aug 2006
Location: Missouri
Posts: 143
Re: Please Give Opinion On This Ladder Test (Pics)

3,4,5 and 6,7,8 needs some further testing; maybe try some smaller load increments. Also, 15,16,17,18 looks like there could be something there. That group is showing more vertical dispersion than the low nodes. Even on the big guns like the 338 Laura, I've seen huge differences in vertical dispersion in as little as .3-.4 grains. Assuming you didn't see any pressure signs at shot 18, you could try another load anove that. 17 and 18 sure produced a nice node forming. Although cratering around the firing pin hole indicates the primer is starting to flow backwards, so if you do go up be extremely careful. Hope this helps.
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  #3  
Old 01-15-2013, 08:54 AM
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Join Date: Nov 2012
Posts: 6
Re: Please Give Opinion On This Ladder Test (Pics)

Thanks, Sharpshooter. I'm not used to pushing the envelope on the high end like that, but 17 and 18 sure are interesting. I'll try an get some pics of that brass up and see if it would cause anyone to back off.
Thanks for your help.
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