So? How do I read this ladder test data?

[docohm]

Just got back from the range and ran these two velocity ladder tests on my 6.5 CM using H4350. On the first test, one round (number 7) didn't fire, bad primer.
Do I have a node here? I'm having a hard time seeing one.
(Redone to show loading data)

And test 2

 

[1moaoff]

6 and 7 would be a node but without charge weights it's a guess... still think you have one higher possibly... depending on powder charge

 

[spife7980]

Its impossible to tell, anyone that can tell is just guessing.

 

[docohm]

6 and 7 would be a node but without charge weights it's a guess... still think you have one higher possibly... depending on powder charge

I just reposted both graphs with the load data shown, 39.1 to 40.9 grains

 

[scissorhands]

Just curious why you didn't load higher charge rates, yours seem very low. There is a node around 41

 

[docohm]

Just curious why you didn't load higher charge rates, yours seem very low. There is a node around 41

It was based on this article: https://ultimatereloader.com/2018/02/18/expanded-10-shot-load-development-for-6-5-creedmoor/

 

[scissorhands]

It was based on this article: https://ultimatereloader.com/2018/02/18/expanded-10-shot-load-development-for-6-5-creedmoor/

In the Hornady manual max charge is listed at 42gn with a 140 bullet. What bullet are you shooting?

 

[spife7980]

You said shot 7 didnt pick up yet it is shot 6, 40.1 of the first series, that is missing in your data. So is your data right or is your data wrong?


Still not enough data to tell nor are there any targets to say how its actually shooting.

When plotted together with the 6.5 guys you get a bit better idea of what they do together.

Load Development Analysis

www.65guys.com

 

[docohm]

In the Hornady manual max charge is listed at 42gn with a 140 bullet. What bullet are you shooting?

It's a 140 gr HPBT from Hornady. The data on the Hodgdon site said not to go over 40.4, I don't have the Harnady book. So, should I load some more on up to 42 gn?

 

[spife7980]

I would test up to 43 grains, stopping if you encounter pressure signs. https://www.primalrights.com/library/articles/understanding-pressure

 

[scissorhands]

41gn H4350 205M primer, Hornada 140gr BTHP .005 off the lands(works for my rifle) In my load development there was the node from 40.9-41.1, so I settled on the 41gn load. I can produce this group over and over again, just need to work on my shooting. LOL

 

[scissorhands]

I don't remember the group size off the top of my head, but with the flier its around .4 MOA and with out somewhere around .26MOA

 

[docohm]

I would test up to 43 grains, stopping if you encounter pressure signs. https://www.primalrights.com/library/articles/understanding-pressure

OK, I'll do that, back to the loading desk!

 

[scissorhands]

Here is part of my OCW test, you can see 40.9 and 41.2 has a pretty close POI. I adjust seating depth at the 41gn to tighten up the group.

 

[sierracharlie338]

I would test up to 43 grains, stopping if you encounter pressure signs. https://www.primalrights.com/library/articles/understanding-pressure

Outstanding article

 

[docohm]

So, I tested 40.9 to 42.9 today, twice. Here's the data, do I see a node between 41.3 to 42.1?

But the 2nd run looks different

 

[Precision Underground]

So, I tested 40.9 to 42.9 today, twice. Here's the data, do I see a node between 41.3 to 42.1?
View attachment 7264448
But the 2nd run looks different
View attachment 7264454

Unless you have perfected your brass prep and loading process and can achieve really low deviation #s consistently a test like this will not tell you much. IMO this test is best suited for a really accurate, heavy barreled gun that is going to shoot any load well. At that point all you are doing is tuning speed.

 

[rangerlong]

I think I’d shoot groups at 41.9 and 42.5 because that’s where you have the best consistency across both tests.

See what kind of SD and group you get.

 

[99106]

I don't remember the group size off the top of my head, but with the flier its around .4 MOA and with out somewhere around .26MOA

What's your barrel length / contour?

 

[scissorhands]

What's your barrel length / contour?

Its a bregara HMR 6,5 creed moor. contour 5

 

[clcustom1911]

Single shot load testing is great to see at what point overpressure begins and where to stop adding powder without doing all kinds of groups and barrel wear. That said with H4350 and the 140/142/143 class bullets in a 6.5 Creed, there are three accuracy nodes I personally load in the middle one. Its faster than factory and brass will still last a long time (6-10 firings depending on your brass prep practices.

I recommend Load and shoot 5 each at 40.9, 41.1, 41.3, 41.5, 41.7, and maybe 41.9 as well. I've done this with Norma, Hornady, Federal, Winchester, and Lapua brass. It works well. And one or more if the loads adjacent to each other will have excellent SD/ES/accuracy. That's gonna be where the middle velocity node is. The upper node is in the middle 42 grain range.

 

[acudaowner]

moving on up to a de lux apartment in the sky ?

 

[Highmiles77]

Opinions please!
I'm new to this game but trying to find a consistent load using Hornady 147 ELD's in my xbolt 6.5 CM.
Starting with 33.3g of RL17 and increasing the first 6 loads by 1 gr. to max 41.6 from bottom to top respectively, the top 2 shots are .5gr over max and 1gr over max, with no sign of over pressuring. I'm thinking this gun is liking the max plus charges? Coal is 0.020 off the lands and cycles perfectly!

 

[clcustom1911]

Opinions please!
I'm new to this game but trying to find a consistent load using Hornady 147 ELD's in my xbolt 6.5 CM.
Starting with 33.3g of RL17 and increasing the first 6 loads by 1 gr. to max 41.6 from bottom to top respectively, the top 2 shots are .5gr over max and 1gr over max, with no sign of over pressuring. I'm thinking this gun is liking the max plus charges? Coal is 0.020 off the lands and cycles perfectly!

That horizontal spread is fantastic. What was the distance to that target? 100? If so, thats a bit too close to do a velocity ladder. You want 300 at minimum so you can see the velocity changes from one charge weight to another.

But I can tell you based on my experience with R17 amd the 147 ELDm, 40.5gr was awesome and I believe 41.5 was good too. However, I chose to use the 40.5 because of R17's temperature sensitivity. If I chose the 41.5, I would be over pressure once the powder got up to about 85-90 degrees or higher.

 

[Highmiles77]

That horizontal spread is fantastic. What was the distance to that target? 100? If so, thats a bit too close to do a velocity ladder. You want 300 at minimum so you can see the velocity changes from one charge weight to another.

But I can tell you based on my experience with R17 amd the 147 ELDm, 40.5gr was awesome and I believe 41.5 was good too. However, I chose to use the 40.5 because of R17's temperature sensitivity. If I chose the 41.5, I would be over pressure once the powder got up to about 85-90 degrees or higher.

This was done at 100 yards, anything beyond this is a 30 mile drive! I'll need to replicate this and make the trip! thanks!

 

[2aBaC̶a̶]

Why not merge the two graphs?