ladder help

[Link]

Hi I couldn't find the ladder test post so I will post here with hope of help.

I think I found a low node but should have gone up on powder to over 34 gr? 31 to 33.7 Varget.
1-14' 68 gr LB00s' 205m
thanks

 

[nosualc]

Looks like 5-6 are a good node, but 7-8 and 9-10 don't look bad either @ 400 yds. 1-4 is not good.

IMO, results are a lot easier to interpret if you shoot two identical ladders side by side. If the same patterns repeat you can trust them, if not, you can't.

I have no opinion on whether to go higher, as I've no experience with 6BR bullets that light. Obvious signs to stop are hard bolt lift, brass flow, etc. etc.

-nosualc

 

[savageshooter86]

I wander why 5-6, 7-8, 9-10 had almost no vertical in pairs, but no more than 2 shots grouped?

 

[Link]

Yes that is one of the things that I wondered.
I shot that ladder with older brass now is the time to switch to some new stuff.
I wonder how much difference there would be fireforming new brass on the ladder?
Being there isn't much difference before and after.

Also the back of the wife's wallpaper makes a nice white background. lol

thanks

 

[Tim Singleton]

I wander why 5-6, 7-8, 9-10 had almost no vertical in pairs, but no more than 2 shots grouped?

I thought that was the purpose of the ladder test ? To reveal the powder charge weights that grouped from the ones that do not
The first shots at the lower velocity are way out of the node. The barrel is liking the higher velocity. 5-6 is a node at that velocity then it's going out of the node as velocity is increasing. IMO Varget is too slow for the lighter bullets in 6br. Maybe try H322 or something in that burn rate with the lighter bullets and look for the higher velocity node. When you re peat ladder test shoot over a chronograph if you can

 

[Link]

About the only powders I have much of are H4198, H4895 and Varget. Would you guys recommend 1 of those over varget for the 6br?

Is it going out of the node in 7-8 & 9-10 because of the slight vertical?

thanks

 

[Tim Singleton]

About the only powders I have much of are H4198, H4895 and Varget. Would you guys recommend 1 of those over varget for the 6br?

Is it going out of the node in 7-8 & 9-10 because of the slight vertical?

thanks

H4198 is to fast. 4895 and Varget are almost the same burn rate.
As far as going out of that velocity node. That is what it is telling me. But it should come into another node just a little higher velocity. That has been my experience. fwiw

 

[jsthntn247]

I would take 5-10 and shoot them in 3 shot groups at 100 yards. You will find that two or 3 of those powder charges will group with a similar point of impact on the target. Pick a load in the center of those and play with seating depth. Somewhere in 5-10 you are going to have a scatter node and the only way to find that is to shoot for groups at 100. This is exactly the reason that I believe relying only on 1 test for load development can be deceiving sometimes.