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Rerun 300-yd ladders or go with what I've got?

 
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  #8  
Old 01-09-2007, 10:24 PM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

Would that show the most consistant velocities at 300 yds is somewhere around 66 grs of powder for that bullet? Is that what we are looking for? Im guessing he set his chrony up at 300 yards and had all these diifernt powder charges loaded attempting to find the most consistant?

Dont mind me I here for class.
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Old 01-09-2007, 10:31 PM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

If Im gussing correctly what we are doing Im with you on 15-17
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Old 01-09-2007, 11:00 PM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

I'd seriously consider thevalidating the speer shot #3 or there abouts and go hunting.

I used to have the fiddleitis pretty bad. If that accuracy is validated or even the load for that first group, you're ready to go shootin.
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  #11  
Old 01-10-2007, 04:28 AM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

Just run a search for Ladder Test and there is a ton of info on it. In short it is a test where you take the bullet you want to use and load from the min to the max charge in .2 or .3 or etc. increments. Then shoot them all at the same target. The barrel harmonics recoils in a figure eight motion with a tighter loop on the top and smaller on the bottom. The bullet that leaves the barrel at the very top of the loop will give you your best group. Take the tighest three bullets from the paper and the middle load will give you the best group for that rifle.

THis is what I understand of it. . . never done it thou
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  #12  
Old 01-10-2007, 09:26 PM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

Roy,

Roger that! I should be retesting some on Friday if the weather holds. Number 3 will get a 3-shot group at 300 yds in addition to #11.

I will also rerun a Speer ladder from 67.2 grs to 70.8 grs in .3 gr increments. This time though I will won't use the same type of target; only a 1" inch square on a big blank sheet of clean newsprint. That way I can see holes w/ my spotting scope.

The Nosler BT will get another ladder from 66.8 grs to 71 grs.

Also plan on running a Nosler 180 AB ladder comprable to the BT ladder.

That should be a "telling" day!
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  #13  
Old 01-13-2007, 04:32 PM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

Ok,

I was able to get out this morning with enough time to run one ladder before my wife said she needed me at home; 180 Nosler Ballistic Tip with Reloader 25.

Looked pretty good. Here are the stats.

Caliber 30-06 Ackley Improved
2nd Firing of brass
Seating info
OAL 3.393 base to tip = 3.760 w/ Stoney pt. 8-12 degrees F`, wind 0-1 mph from 10-11 o'clock
Shot 20070113, 0900-1100 hrs
Reloader 25
No sizing, so far. Will probably order a Redding Body die to keep shoulder in check.
Primers punched w/ Lyman Universal decapper then neck sized with Lee collet die; Used standard .3055" diameter decapping rod.
Brass info Brand Length fired/sized headspace
Winchester
Federal 210Match primers
Prep & notes Die used Seating die settings
Forster Ultra seater w/ custom 30-06 Ackley insert
Round # Powder Chg Wt Velocity Comments
1 66.8 2837 72% humidity win
2 67.1 2860
3 67.4 2878
4 67.7 2922
5 68 2890
6 68.3 2935
7 68.6 2953
8 68.9 2935
9 69.2 2977
10 69.5 2955
11 69.8 2955
12 70.1 3021
13 70.4 3035
14 70.7 3037 Ejector mark and hard bolt lift.
71 Did not shoot, 66% humidity

http://i26.photobucket.com/albums/c1...er20070113.jpg

I pulled the weather data from weather.com but read the wind and temp with my Anometer.

Numbers 13, 14 and 15 were looking pretty good until #15 showed an ejector mark and the bolt lift was hard; time to backoff. Plus, shooting this load at 8-12 degrees F would only tempt more pressure when shooting in warmer weather, IMHO.

Numbers 1 and 2 were from a cold (to say the least) clean barrel and are at the bottom left, possibly out of view of the cameras lens. Things got interesting with #3,4 and 5; want a little more velocity though. I like 9, 10 and 11. Some definate nodes.

Opinions?

Oh yeah, the aiming square was 1-3/4" inside. I was able to hold my cross hair at 14x.
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  #14  
Old 01-13-2007, 05:11 PM
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Re: Rerun 300-yd ladders or go with what I\'ve got?

Yep, looks like you about have it figured out. It should do you well this fall or maybe sooner. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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