madmixerman
Gold $$ Contributor
Help with BRA ladder test
- Thread starter madmixerman
- Start date
foxguy
Gold $$ Contributor
Did you use a chronograph in conjunction with the Ladder?
To me, but I too am just starting....ladder testing.
1st - 300 test looks like 31.2, 31.3, & 31.4
2nd - 300 test looks like 31.3, 31.4, & 31.5, altho on target #2 you do have 2 shots labeled 31.5?
At 600 it appears to me both targets with shots labeled 2,3,4.
I too believe I would do more testing around loads 31.2, 31.3. 31,4 & 31.5 - Possible 3 shot groups @ 300 / 600 yds. I would use a Horizontal Line with 4 - 1" bullseyes on the line, shooting each powder load at 1 of the bullseyes. and then compare, looking for the best ones. you may find they all to look pretty good, or 1 load that doesn't look quite as good as the others. Good luck.
To me, but I too am just starting....ladder testing.
1st - 300 test looks like 31.2, 31.3, & 31.4
2nd - 300 test looks like 31.3, 31.4, & 31.5, altho on target #2 you do have 2 shots labeled 31.5?
At 600 it appears to me both targets with shots labeled 2,3,4.
I too believe I would do more testing around loads 31.2, 31.3. 31,4 & 31.5 - Possible 3 shot groups @ 300 / 600 yds. I would use a Horizontal Line with 4 - 1" bullseyes on the line, shooting each powder load at 1 of the bullseyes. and then compare, looking for the best ones. you may find they all to look pretty good, or 1 load that doesn't look quite as good as the others. Good luck.
madmixerman
Gold $$ Contributor
No I didn't use a chronograph. I do have two marked 31.5 on the one target. Ironically the paper that I had original numbers marked on it went out in trash today. So I can't say which one is 31.5 or 31.7.
urbanrifleman
Site $$ Sponsor
I would say "completely inconclusive" as a casual observer.
pat fulghum
( ͡° ͜ʖ ͡°)
it does look a little too inconclusive.... SO that opens up a lot of questions..
How confident are you in your aiming? Do you feel you can hold aim point at 1/4" or better at 300 yards? (ie free recoil with 50x scope ?)
Was powder weighed with laboratory scaled?
Are you sure you put them in the box the right way?
Was barrel pre-fouled or clean and shiny?
How confident are you in your aiming? Do you feel you can hold aim point at 1/4" or better at 300 yards? (ie free recoil with 50x scope ?)
Was powder weighed with laboratory scaled?
Are you sure you put them in the box the right way?
Was barrel pre-fouled or clean and shiny?
Do you have at least 100 rounds on barrel?
What Bullet/Powder/Primer/Barrel combo?
How far are you jumping / jamming? (and tell me the cartridge overall length just to double check)
Have you tried a known good combo?
I would be glad to help... but just need a lot more information...
What Bullet/Powder/Primer/Barrel combo?
How far are you jumping / jamming? (and tell me the cartridge overall length just to double check)
Have you tried a known good combo?
I would be glad to help... but just need a lot more information...
madmixerman
Gold $$ Contributor
Charges weighed on a fx120i. Loaded night before put in box nose up. Five foulers shot before first test and two before starting second part of the test. Barrel was completely cooled before starting second test. Varget,cci450, Berger 105 match seated to touch.. .002" neck tension.Kreiger 8twist with 175 rounds. Been shooting 31.1 h4895 with Berger 108.Been having some erratic results in matches with it.Thought I'd try a fellow shooters Varget setup.
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foxguy
Gold $$ Contributor
Ah , I could be wrong, But I would stay away from seating bullets just to touch. With most bullets sometimes you are just touching, sometimes just in a little, and some times you are just off touching. I have been told that variable can change your Velocity causing erratic groups. I would try either .005 in or .005 off touch. I wish you the best of luck and good shooting.
pat fulghum
( ͡° ͜ʖ ͡°)
@madmixerman
Looks like you are doing things right.
But I do agree with @foxguy, either jam or jump, never touch.
My COL with a 105 Hybrid is 2.385... I use 30.9gr H4895 with CCI450 in a 30" Bartlien right at 2990.
I assume you have a 28" Kreiger and I have a couple buddies with 28" Kreiger 1:8, and we shoot almost identical loads.
You say 31.1 H4895 with 108... In my gun that is way above max due to the long 108 bearing surface.
I do use 108 BT (30.6 H4895) when i'm at end of life of the barrel and can seat the 108 due to throat erosion from 105's Hybrids.
You want to make sure that the bearing surface / tail junction of the bullet is well ahead of the neck/shoulder junction of the case.
I do have to sort my 105 Hybrids (looking for the few odd balls in the batch), but the 108BT are much more uniform. I do see over .050 difference in overall length with 105 Hybrids between lots... You might want to watch this.
When you say "Berger 105 Match"... I'm not sure if that is the older boattail 105 or the 105 hybrid. I have never shot the 105 Boattail as the 105Hybrid has better ballistics on paper.
The only time I use Varget is during very first fireform (30.0gr with 105 Hybrid, .005 into the lands).
If I was you... take the known good 108BT jump them .015 to .020 with 30.6gr +- .2gr and see where you end up.
Just my $.02.
Looks like you are doing things right.
But I do agree with @foxguy, either jam or jump, never touch.
My COL with a 105 Hybrid is 2.385... I use 30.9gr H4895 with CCI450 in a 30" Bartlien right at 2990.
I assume you have a 28" Kreiger and I have a couple buddies with 28" Kreiger 1:8, and we shoot almost identical loads.
You say 31.1 H4895 with 108... In my gun that is way above max due to the long 108 bearing surface.
I do use 108 BT (30.6 H4895) when i'm at end of life of the barrel and can seat the 108 due to throat erosion from 105's Hybrids.
You want to make sure that the bearing surface / tail junction of the bullet is well ahead of the neck/shoulder junction of the case.
I do have to sort my 105 Hybrids (looking for the few odd balls in the batch), but the 108BT are much more uniform. I do see over .050 difference in overall length with 105 Hybrids between lots... You might want to watch this.
When you say "Berger 105 Match"... I'm not sure if that is the older boattail 105 or the 105 hybrid. I have never shot the 105 Boattail as the 105Hybrid has better ballistics on paper.
The only time I use Varget is during very first fireform (30.0gr with 105 Hybrid, .005 into the lands).
If I was you... take the known good 108BT jump them .015 to .020 with 30.6gr +- .2gr and see where you end up.
Just my $.02.
My BRA has been shooting very good with 31.2 to 31.5 of Varget and a 103 Vapor Trail seated either .005 in or .005 off. "Touch" on any of my rifles has been a complete disaster.
mikeeg02
Michael Glantz
What did you find yours liked for primers at those charges ?
madmixerman
Gold $$ Contributor
Thanks guys, I will not be loading to touch anymore.
its not inconclusive, 2,3,4 from the 600 yard target. Its repeated. Thats where you want to be. Its very simple.
In my pea sized brain!
Your 300 yard test is one that I struggle with as the spread appears to thrown off by seating depth. I've seen this before in my own ladder tests also the .1 gr increments tend to clutter the target. Your 600 test is easier to read.
I always start testing .2 gr increments on the lands creating a benchmark 'other people have other methods.
If this were me I would ladder test again using .2 gr and make sure your on the lands, then place the samples side by side. I believe your node will be defined.
Then go to seating test at 600
Have a nice day shooting
J
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