• The Shot You’ll Never Forget Giveaway - Enter To Win A Barrel From Rifle Barrel Blanks!

    Tell us about the best or most memorable shot you’ve ever taken. Contest ends June 13th and remember: subscribe for a better chance of winning!

    Join contest Subscribe

Need help to understand my ladder test

leoestby

Private
Full Member
Minuteman
Dec 1, 2011
34
0
40
Kaliber: 223Rem
Bullet: Nosler CC 69grs
Brass: Norma
Powder: Norma 203-B
Primer: Federal 205

Round-robin fired at 420m (As described by Jason Baney)

1qgz78.jpg


Lot 1: 24,0grs (ES 12m/s for 3 shoots)
Lot 2: 24,3grs (ES 5m/s for 3 shoots)
Lot 3: 24,6grs (ES 15m/s for 3 shoots)
Lot 4: 24,9grs (ES 12m/s for 3 shoots)
Lot 5: 25,2grs (ES 5m/s for 3 shoots)
Lot 6: 25,5grs (ES 3m/s for 3 shoots)

Groop 4 is tight and "inside" group 3

Group 6 is tight and five out of six shoots for group 5 and 6 is within 67mm.... (the velocity spreeds are less than group 3 and 4)

As this is my first ladder test, I dont really know what to look for...? I'm going to verify the laddertest later, but I realy would like to hear from you guys. :)
 
Re: Need help to understand my ladder test

Read over this <a href="http://www.6mmbr.com/laddertest.html" rel="nofollow" target="_blank">"ladder testing".
</a>

I would say your sweet spot is lot 3-4.

Terry
 
Re: Need help to understand my ladder test

Agreed. Between 3 and 4. Load up a second test:

24.5
24.6
24.7
24.8
24.9
25.0

You shouldn't see a lot of spread from these charges. It will probably be pretty even. If so, then your optimal charge for this combination is about 24.7 or so.

Sind Sie Deutscher?
 
Re: Need help to understand my ladder test

I will add one more time to this mix. The ladder test is where it pays to have a good scale, and be able to maintain your charges weights in you groups as tight as possible.

Terry
 
Re: Need help to understand my ladder test

Did my verification test today. Same ladder test.

I set my bullets 0,03" deeper due to magasine length.

Loaded up 7 Lot

1: 24,3
2: 24,5
3: 24,7
4: 24,9
5: 25,1
6: 25,3
7: 25,5

1gqerb.jpg


I then plotted the data from both tests in an excel sheet:

jrwprr.jpg


I'm realy happy with my resault with this bullet, and going to fine tune my load by changing seating depth and primers with 24,6grs powder.



Test of seating depth at 100m
rj4cir.jpg


2nly6q8.jpg


I'm happy with the resault of the laddertest.


 
Re: Need help to understand my ladder test

Point of impact above my aiming point is on my vertical axis, found the senter of the 3 shoot groups and measured vertically.
 
Re: Need help to understand my ladder test

Hi again!

I'm gona perform a ladder test for my 308win barrel. I'm planing to mount a suppressor on the barrel. So my question is: Will the ladder test resault be different with or without the suppressor?

Should I wait until the supressor is mounted?