load testing non result: any ideas?

emn83

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Feb 11, 2012
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east Iron Range, Minnesota
so, I took the rifle out today to do some initial testing, just to see what she can handle, max load wise. Found out, that the temperature of the powder really makes a difference, and so does distance shot. I am shooting a .308 win, here are the specs on the load(s)

Hornady brass
Federal GM210M primers
Berger 155gr Hunting VLD
Varget (40-47 grains)


The tempurature today was 34 degrees when I was shooting, it was about an hour from when I started to when I finished, fired 17 rounds total. I was only shooting 100 yards. Today I was planning to see what my max load was, as well as do an informal initial ladder. since I was using an extreme powder, I was hoping that the later cartridges cooling over time wouldn't have that big a difference. I was wrong.

Here's my target:



obviously, there,s no real usable data from the target. In addition, looking at my brass, I got a very slight ejector mark at 46.0 grains, but that was it for pressure signs. I think I learned my lesson, I think I'll be waiting till it's warmer to do load testing for real, in 5 months.

putting 17 rounds in a 1.52 inch group at 100 yards, when there's a 7 grain spread in powder charge, has me questioning my sanity a bit
 

green 788

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Feb 5, 2005
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563
It's just a good rifle, and good bullets... and the powder charges are all working well.

I would do an OCW work up... then you'll really find out what's going on... you can find my OCW page from the bangsteel site linked below... there's a link on OCW consulting page... the system works. :)

Dan
 

emn83

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Joined
Feb 11, 2012
Messages
801
Location
east Iron Range, Minnesota
It's just a good rifle, and good bullets... and the powder charges are all working well.

I would do an OCW work up... then you'll really find out what's going on... you can find my OCW page from the bangsteel site linked below... there's a link on OCW consulting page... the system works. :)

Dan
Thanks for the advice! with how the target racks are at my range, it's hard to set up multiples to do an OCW, that's why I was thinking about doing a ladder. Thinking that if that wide a range in powder charges gets me that group, when I find the sweet spot, the rifle is really going to shine
 

Joe King

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The cold part of Montana
Since you saw ejector marks at 46gr, I would just back off 2% which is 45gr and go with it, I bet when your seating depth is sorted out and you find the primer it likes, it'll drive tacks. Trying warm temps with a Hodgdon extreme probably won't show you much. I'm also betting that you would have seen similar results at 80*:)
 

4ester

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Mar 30, 2010
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Wyoming
How do you complete a ladder test at 100 yards?

Thats way too close if you are trying to find a node.
 

emn83

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Joined
Feb 11, 2012
Messages
801
Location
east Iron Range, Minnesota
so, I'm thinking, since I saw that ejector mark at 46, to use that as my top end MAX load. I have tomorrow off, so I was thinking about going out and shooting some 3 shot groups with 44.4-45.8gr, loading .2gr increments. From there, I'd take the top 3 for grouping, and do some more testing. what do you all think?
 

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