6.5 Creedmoor-Shooting compressed loads.

Atlas said:
I picked up the Hornady 10th edition reloading manual (cause I really liked their 147gr custom match ammo) and they didn't even have THEIR OWN bullets in it!
I didn't realize that the 147 ELDM was new enough to not make it in their latest manual -_-
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It’s on the Hornady web site. Pretty awesome bullet
 
todbartell said:
Typically this is because of incorrect start pressure. The program default would represent a ton of freebore, which will reduce pressures. In real world, seating close to lands, pressure will rise. Prediction vs reality should be fairly close when the correct info is plugged into QL. Like all loading, start low and work up. Tuning the burn rate to match measured velocity from your rifle will allow QL to really shine. Berger and Hornady both use QL to build data for their manuals, so it's not a bad program.



https://press.hornady.com/assets/site/hornady/files/load-data/6-5-creedmoor-147gr-data.pdf
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It may not be a bad program, but it is still a calculation, and variations in chamber dimensions and components prevent a program from ever being as good as actual testing.
 
stubblejumper said:
Quickload calculations, and reality, are not always one and the same. I have seen pressure issues with some loads that Quickload listed as not being near maximum.

As far as the 6.5CM is concerned, I am fairly new to loading the cartridge, but R-17 is where I found the best results.
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Of course. That's why I said 'predicts'. QL is pretty clear about that too- that paragraph of warnings and notes is pretty hard to miss. ;) A lot like ballistic programs, I've found QL to be quite accurate if the guy doing the inputs is careful. FWIW, TB's QL numbers for H4350 and IMR4451 are within a few FPS for both of my 6.5CM rifles.
 
WHY PUSH THE CREEDMOOR 6.5 BEYOND 2700 WITH A 140 OR HEAVIER??? Hunting purposes deer will never know the difference.
H4350 is a great powder for this caliber very accurate. More speed wanted go to a (WSM 270), same weight of bullet but a hell of a lot faster.
 
LittleBoyLefty said:
No doubt. That's impressive velocity with 26. We've shot a lot of the 147 ELD and I pretty quickly settled on H4350 or IMR4451. It's been easy to get good ES/SD numbers and very accurate loads with those powders, but definitely not getting the velocity that QL predicts for RL26.
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R26 gives me about 115 fps more before showing similar pressure signs as H4350 or 4451.
 
todbartell said:
Typically this is because of incorrect start pressure. The program default would represent a ton of freebore, which will reduce pressures. In real world, seating close to lands, pressure will rise. Prediction vs reality should be fairly close when the correct info is plugged into QL. Like all loading, start low and work up. Tuning the burn rate to match measured velocity from your rifle will allow QL to really shine. Berger and Hornady both use QL to build data for their manuals, so it's not a bad program.



https://press.hornady.com/assets/site/hornady/files/load-data/6-5-creedmoor-147gr-data.pdf
Click to expand...

39775004020_bcf0924ff1_o.jpg
 
I made it to the range today and these are the results I got from the chronograph.
I checked each piece of brass once I got up to 46 gr, and nothing showed any signs of pressure. I know from some hot Normal 300 WBY rounds that it starts leaving plunger marks when pressure gets high.
No sticky bolt, and my velocities seemed low, so I shot all the rounds up to 48gr.
Temperature:-1c
COAL: 2.802"


Notes: New hornady brass. Chamfer ID+OD only
Powder Powder weight (gr) Velocity (FPS) Temp Date Comments COAL
RL26
44gr
2584 26-12-2018 2.802”
2585
2634
2586
2601

44.5gr
2637
2593
2611
2603
2594

45gr
2654
2661
2666
2640
2663

45.5gr
2709
2661
2687
2688
2712

46gr
2708
2761
2746
2714
2753

46.5gr
2754
2766
2711
2804
2756

47gr
2781
2772
2769
2767
2781

47.5gr
2787
didn’t record
2800
2787 pulled shot.
2806

48gr
2802
2824
2790
2798
2805
 
And a photo of the groups at 106 yd. All 5 shot groups.

Less than stellar accuracy. Hornady custom match 147gr ammo was getting consistent sub-1/2 groups the first and second time out shooting the rifle.

46gr was decent, and I THINK 47gr may be off due to my shooting.
Where to go from here?


https://imgur.com/a/wuFMn0q

Edit: Not sure how to insert an image directly.


If you feed Quickloads your actual FPS, temp etc, can you use it to calculate more accurate pressures?
Or is it not something that you can calculate backwards like that?
 
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Your velocities are all over the place, When I use H4350 out of my 24 inch barrel, I average 2750 fps with 140 VLDs, I get an extreme spread of 6 to 7 fps
this translates to sub 1/2 moa down range.
RL26 has more speed but it comes at a cost.
 
brnolvr said:
Your velocities are all over the place, When I use H4350 out of my 24 inch barrel, I average 2750 fps with 140 VLDs, I get an extreme spread of 6 to 7 fps
this translates to sub 1/2 moa down range.
RL26 has more speed but it comes at a cost.
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I don't see that. The ES of 47.5 and 48 looked very good, to my eye.

But shooting results are determined by holes in paper, not the chrony.

Shooting at 100 does not mean much, unless that is the distance you intend to shoot.

I suggest you shoot 47.4 47.7 48.0 at 300 yards and look at the targets. They should tell you something.

And, do you have a 'control" load? Something else know to work quite well? Shoot it, too.
 
todbartell said:
tell us about your rifle? Make, model, barrel length? Any idea how far off the lands you're loading?
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Blaser R8 in 6.5 Creedmoor.
24" barrel, fluted-match weight.
1-8 twist rate.
No idea how far I am off the lands. I'm going to try and borrow one of those OAL? gages from a friend this week.
 
Atlas said:
If you feed Quickloads your actual FPS, temp etc, can you use it to calculate more accurate pressures?
Or is it not something that you can calculate backwards like that?
Click to expand...

Looks like your loads ranged in the 46,000 to 58,000 psi ballpark. I would play around in the 44.5-46.0gr range and retest at 300m or further
 
I do 1% increments, or 0.4grs for the Creedmoor sized case. You can try smaller increments but the changes don't really show up on the target
 
Finally tracked down an 8lber of Rl26.
Below is a photo of the new 8lb, and my old 1lb. Is CE0519 the lot number meaning they came from the same batch of powder? Or is the 8lb missing that bit of information that the 1lb has on it?


https://imgur.com/a/TaJuvkp
 
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