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Ladder test - assistance interpreting results

 
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  #8  
Old 05-20-2010, 08:13 AM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,193
Re: Ladder test - assistance interpreting results

I also like the 3 shot each test with a target for each group (Results are easier to interpret)
and I put all the information,Load data,cartrige,rifle,Velocity,Standard deviation, Extreme
spread, conditions and yardage for later records if something looks good.

I find that poor records don't do any good after a while when your going over them to see
what they did with a different powder/bullet combination (Old Timers) and all the data.

I keep records of everything that has been done with the rifle/pistol in individual 3 ring binders
for each of my rifles/pistols and find it invaluable at a later date if accuracy starts to drop off.

It sounds like a lot of trouble but it saves time and money and if you go somewhere different
you can use the drop charts that were used years earlier once you verify your zero.

I have even carried the note book with me to refresh my mind with the performance under those
conditions ,Altitude,temp,humidity,wind effects ETC.

Good luck and good hunting

J E CUSTOM
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  #9  
Old 05-21-2010, 09:49 AM
Gold Member
 
Join Date: Mar 2006
Posts: 831
Re: Ladder test - assistance interpreting results

I also shoot 3shot groups for ladders with 3different loads
Just color the bullets with sharpies
I like blue green and red and shoot them round robin just
like in the sticky on ladder shooting
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  #10  
Old 05-25-2010, 01:40 PM
Miller Outdoors
 
Posts: n/a
Re: Ladder test - assistance interpreting results

I thought I'd update this with results.

After the ladder test and seeing your input I decided to load the following:

165gr Gamekings 2.830" OAL (.027 off lands)
1- 45.7gr = 2666 fps
2- 45.7gr = 2677 fps
3- 45.7gr = 2682 fps
4- 45.7gr = 2688 fps
100 yard group resulting from these shots: 1.037"

(I was also going to load up some at 44.1gr also, but ran out of Varget so I put it off. Glad I did because I've since decided to stick with the heavier .308 bullets)

180gr Gamekings 2.820" OAL (.027 off lands)
1- 43.1gr = 2510 fps
2- 43.1gr = 2506 fps
3- 43.1gr = 2515 fps
4- 43.1gr = 2510 fps
100 yard group resulting from these shots: 0.692"

5- 44.3gr = 2594 fps
6- 44.3gr = 2588 fps
7- 44.3gr = 2583 fps
8- 44.3gr = 2588 fps
100 yard group resulting from these shots: 0.650"

After looking at these results and plugging all velocity and ballistic coefficient info into dropcharts (shows heavier bullets have significant downrange advantages) I'm giving up on the 165gr bullets.

I then loaded up another set of the 44.3gr rounds with OAL's .02 longer and .02" shorter - the original 2.82" load outperformed both, so I'm sticking with the OAL of 2.82".

I took this ballistic data and printed off a dope chart and loaded up another 20 rounds. Took out the 10" metal gong target and shot at 300, 400, 500 and 600 and the dope chart is scary accurate up to the 600 yard max range that I shot it at.

So, I've got a good, accurate 180gr hunting load and long-range confidence.

Since the Berger Hunting VLD's have had good reports on game, and a bit higher BC than the Sierra Gamekings, I figured I'd work with some of the heavier VLD's. Did a similar ladder test and load workup with the 185gr Berger VLD's and have worked up an even more accurate load averaging 0.561" at 100 yards. I've ordered some 200 gr Gamekings and some 210gr Berger Hunting VLD's - when they get here I'll do a similar ladder test and load workup on both of those.
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  #11  
Old 05-25-2010, 02:33 PM
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Join Date: Aug 2008
Posts: 171
Re: Ladder test - assistance interpreting results

Thanks for the update! Good shooting....
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  #12  
Old 05-25-2010, 04:17 PM
Gold Member
 
Join Date: Mar 2006
Posts: 831
Re: Ladder test - assistance interpreting results

Good job and good shooting.
It's nice when the process works and you get the results you are looking for.

Congrats!
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  #13  
Old 05-25-2010, 10:10 PM
Gold Member
 
Join Date: Apr 2009
Location: Carrollton, Ohio
Posts: 534
Re: Ladder test - assistance interpreting results

Great to hear you have good loads! Nice shooting too!
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