Help troubleshooting low 6.5 creedmoor velocity

[zabada]

There’s a lesson here about using actual tested and published data, NOT Quickload, as well as using data for the correct powder. Don’t mix up data between the three different 4350 powders, they are not the same thing.

Accurate publishes data for their powder, and it’s free online. Western Powders 8.0
Their data for AA4350 and the old 140 Amax (which became the ELD-M) shows a max of 43.5gr at 2.740”.
Hodgdons free online data shows the same thing.

Use real data and back away from the Quickload; it’s the least reliable “data” you’ll find.

I actually did use Hodgdons data to adjust my COAL and put me at ease loading almost to 44gr.

I appreciate all the help I get on here, and the quick load data was new to me. It may be right, I am not sure. But the hodgdon data best corroborates my results.

 

[straightshooter1]

Use real data and back away from the Quickload; it’s the least reliable “data” you’ll find.

Quickload requires reliable data input to be "reliable". It should be relied on without good data. It's always a matter of garbage in, garbage out.

 

[Yondering]

Quickload requires reliable data input to be "reliable". It should not be relied on without good data. It's always a matter of garbage in, garbage out.

Agreed, if the correction above is what you meant.
It can produce reasonable results but requires very accurate data input to model your own rifles chamber and the loads. But that requires a fair amount of work to get right, and even then is just a prediction rather than measured data.

 

[GoferDog]

In developing loads and measuring with Labradar, I found the 6.5CM velocity was far more effected by the distance off the lands than other cartridges I have reloaded. I also found guys on-line finding the sweet spot at .100 off the lands. One consistant thing I found in my load workup was the farther of the lands, the greater the velocity. I attribute this to burn before thru the lands, thus less burn for the push down the barrel. I believe one of the differences in 6.5cm is the depth of the barrel grooves or in reverse, the greater the bullet swaging, thus more energy to engage and move forward. ALL my loads across all powders were less than published values in my gun, and only came close when I was beyond .060 off the lands, yet still under published data. To further this is the "published" data will be on a deeper set bullet to be conforming.

This is possibly the stupidest thing I will read all year

 

[GoferDog]

The 6.5 needmoor. Was designed to shoot 600 yds. it was made for HP shooters, for X course. 2-3-600 yds.
If you want speed, rechamber to a 260 AI, or better yet, Shoot a 6.5X284 with your 140's.
Or only shoot 130 gr pills. you can get almost 2900 with 130's
at 2650 fps, you might as well shoot a .308 with 175's.

Lol lol lol. I think the Creedmoor is a gay as aids but you won’t see a significant jump in velocity by rechambering, the case capacity is very similar. Most 6.5x47 hand loads are significantly faster than Creedmoor hand loads - it’s the poor quality Hornady brass that holds the cartridge back in regards to velocity.

 

[Yondering]

The 6.5 needmoor. Was designed to shoot 600 yds. it was made for HP shooters, for X course. 2-3-600 yds.
If you want speed, rechamber to a 260 AI, or better yet, Shoot a 6.5X284 with your 140's.
Or only shoot 130 gr pills. you can get almost 2900 with 130's
at 2650 fps, you might as well shoot a .308 with 175's.

Interesting theory.

So my 22" el-ceapo Ruger American Predator in 6.5 Creed is pushing a .703 G1 (145gr) @ 2725 fps according to my chrono and drop data. Please tell me how I can do that with a 308 with 175s, I'm too slow to figure it out.

 

[Badmonkey]

Hello all -

It seems I’m getting pretty low comparative velocities with some reloads and I’m hoping someone can help me troubleshoot why.

TL;DR I think it’s the choice of powder, and looking for potential confirmation.

Gun:
Ultimatum Deadline action
Hawk Hill 24” - ~600 rounds through it

Load:
Hornady 140 BTHP
Hornady once fired brass cut to 1.910-1.915
CCI 400 primers (not the best but have worked fine for me lately given availability)
Accurate 4350 - min 40.4 gr, max 41.8 gr in .2 increments

Results of ladder test:
1. 2401
2. 2426
3. 2448
4. 2474
5. 2463
6. 2500
7. 2521
8. 2529

Based on my searching and reading about 140 gr 6.5 with Accurate 4350, I think I should be getting about 2700 fps with 41.8 gr.

I have worked up loads with 147 ELDM that shoot true to expectations out of the same once fired brass, and factory loads shoot true enough to their stated velocities for me to rule out the barrel
having lost velocity and the chrono (magnetospeed v3) having issues.

Is accurate 4350 just not good at getting high velocities with this cartridge?

Or am I making a mistake elsewhere.

Thank you!

You are getting similar results to me when I started with A4350. I’m getting 2810 with Match Burner 140s loaded to 44.6 grains, lapua brass, in a 26” benchmark. First ladder with Hornady 140s was as follows:

42.0- 2526
42.2- 2565
42.4- 2603
42.6- 2611
42.8- 2620
43.0- 2638
43.2- 2661
43.4- 2676
43.6- 2679
43.8- 2690

And to give you an idea how fast my barrel is with a common load, I’m now running 147 eldms with 41.4 grains of H4350 at 2804fps.

My opinion, you can probably get the speed where you want it with A4350, it just takes more powder than you’d expect.

As far as pressure, no signs at all with 44.6. Had heavy bolt lift at 45.0. I would suggest doing another ladder starting in the 42.5-43 range and take it on up until you get the speed you want, or run into pressure.