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test results help: UPDATE 300 yard test

 
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  #1  
Old 04-01-2013, 02:26 PM
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Join Date: Feb 2012
Location: Iron Range, Minnesota
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test results help: UPDATE 300 yard test

Got a chance to go to the range today, it was cold and pretty windy, but after being cooped up all winter, I took a chance and hit the range.

Conditions:
100 yard range
Sunny
Temp:22 degrees
Pressure 30.06
Humidity: 32%
wind 15 MPH from 9 o'clock

components:
Brass: Lapua .308 Win standard
Powder: IMR 4895
Bullets: Berger 155 Grain Target VLD
Primer Federal GM 210M

First target: 44.8 grains


Second target: Top 44.6 grains, bottom 44.9 grains


Third target: Top:45.0 grains, bottom: 44.7 grains


taking out some of the horizontal because of wind, it looks like 44.6 and 44.9 grains offered the best groups.

any thoughts and/or comments are appreciated
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Old 04-01-2013, 02:44 PM
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Location: Meridian, Idaho
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Re: test results help

Horizontal IMO, as you mentioned, should be ruled out. That is lot of wind.

Verticle: I believe you are on the right track. However, in my experience powder amount is helpful but how far off the lands are you should be considered as well. My rifle shoots almost the exact same spot with 1 grain powder change. For example 56.5 and 57.6. 57 vertically strings the bullets. My rifle also likes .075 off the lands more than it did .050 for the same powder amount.

Perhaps you could load up some in the 44.6 to 44.9 with varying seating depths?
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Old 04-01-2013, 03:02 PM
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Re: test results help

Thanks for the reply. My next test, depending on what input I got, was going to be Berger's recommended test. All those loads were .010 off the lands, debating, since I use the gun for hunting, to try touching the lands, or just use .010 off the lands as my longest OAL...that was 2.200 base to ogive as it stands
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Old 04-01-2013, 03:15 PM
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Re: test results help

I am sure an expert will chime in but I think you are headed the right direction. My LR rifle has a long throat and with the bullets .015 off I did not have enough bullet in the neck. I had the same issue with a couple of other rifles too. My 3006 has a short throat and is solid at .010 off.

Anyway, I happen to believe that for hunting, a repeater, and possibly someone else shooting/handling my rifle it was best to pull the bullets back and seat them deeper. It worked for me. I like the fact it seems to be fine with .075 off right now and the bullets are not knocked off center easily.
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Old 04-01-2013, 06:09 PM
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Re: test results help

looking at the data, 44.6, 44.8 and 44.9 had the smallest vertical spread, I'm thinking, I'll load each of those again, with loads .010, .050 and .090 off the lands and see how it goes
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  #6  
Old 04-01-2013, 06:49 PM
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Location: Northern MN
Posts: 205
Re: test results help

Hello emn83,
Was certainly a little nippy this morn...I shot a couple of groups at home with a new lot of bergers and some new brass in a couple of my 260s...I had a gusty 2:00 wind at about 5-10 definitely will spread out your groups....Both were wearing a different scope so after the sighters a .53 & .56 were very respectable for me (the SDs were bad but expected with new brass)...They should only get better after the new brass gets a couple more firings and I fine tune the seating (new dies at Berger make a whole new bullet)...

Your charges seem to be in a good node...Normally if you get to your sweet node the groups won't change too much plus or minus a couple of tenths...When you start your seating tests stick with one charge in your case
average out your best 4 and it looks like 44.7 or 44.8....Did you happen to shoot these over the chrono?

After the first seating test you can narrow that down even more with a couple more seating tests....I generally try .010, .020, .030, .040 .050, .060, .070, .080 &. 090 the first time....The second time I take the two or three best ones
and go in .005 increments in each direction from them....

Once I find what seems to be the best seating then I go back to the charge and work both ways from there....If accuracy picks up at another charge then I once again work the seating .003 in both directions...Usually you will find a home for both but sometimes it takes a couple of trys....Better than random chasing your tail.

BTW I sent you a PM with the rifle club info.

Good shooting,
Randy
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  #7  
Old 04-01-2013, 07:13 PM
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Re: test results help

Randy,
That wind combined with the cold made for some unplesent shooting over 29 rounds and about an hour of somewhat hurried shooting.

I used my chronograph (shooting Chrony F-1) when I did my initial testing, 44.8 grains (with a statistically insignificant 3-shot group) averaged 2941FPS with an ES of 29 and SD of 14.53. That was also the best 3-shot group of the day at .539MOA with a .385 vertical.

Today I had chrony issues, a bunch of errors, and velocity readings that had a range of 1500 FPS (got what I paid for with a free chrony)

I'm thinking, I'll go with 44.8 grains, because it's had the best overall results. I'll rough in my load going .010, .050, .090, .120 off the lands, like in the Berger manual, for now...my seater die does not have a micrometer, so the real fin adjustments are very difficult.

Got your PM, gonna get my self organized and get that mailed out.

Erik
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