6.5BR loads and vel

[constructor]

Loads tested in 20" Krieger Criterion barrel, CED and Oehler chrono back to back.
Lapua brass, CCI 450 primers, 123 Hornady Amax,.
H4895--29.5gr=2554fps
----------30.5gr=2750
----------31.0 gr=2772
----------31.5gr=2806
----------32gr=2853--this load is near max for capacity and pressure

N530---31gr=2865--this load near max for pressure

N540----32gr=2704
----------33gr=2812--this load near max for pressure

Re15----32gr=2695
----------33gr=2785--near max for capacity

H335----31gr=2692
----------32gr=2755
----------33gr=2794--near max for pressure.

2520-----34gr=2791

760------34gr=2574-IMO burn rate too slow

748------33gr=2661
----------35gr=2785


Anyone that has ever shot a Grendel knows about 2550 is max from a 20" barrel.

Dennis, give me a day or two and I'll run the BRX tests.
tests run with an 18" Krieger, Lapua brass, CCI41 primers, 123gr Hornady Amax

6.5BRX test results-18" barrel

33gr H4895=2781fps
34gr--------=2838

34gr RE15=2774
35gr-------=2809
36gr-------=2857

35gr N540=2830

36gr 2520=2858

36.2gr 748=2842
37.2gr-----=2905--near max for pressure

18" 6.5BRX 100gr TTSX---
36gr H4895=3048
39gr 748=3043
37gr H335=3093


I didn't push the BRX as hard, getting kind of late and a 6lb 260 more or less kind of beats on me after a while.
I'll do some more in a few days.

DO NOT use the large diameter decapping pin in the resize dies. The small 6BR decapping pins must be used so the lapua brass is not destroyed.

[JGB Arms]

How far is your Chrono from the muzzle? Did you use new brass? What size bushing are you using in your die?

The results you have posted for the 6.5BR in RE15 and H335 are similar to our peak results in new brass. Somewhere around 32.5gr of H335 our brass would "doughnut" at the bottom. We have noticed that the Amax is a faster bullet than the SMK (with respect to identical powder charges).

We see a major pressure change occur when we go the the second firing of the Lapua brass. The brass volume increases about .5gr (water) once it is once fired and the brass shows pressure signs with smaller charges (Primer craters and ejector / extractor marks). Any thoughts?

The varget load you posted recently seemed to have a boring speed (2590 - 2625ish) but proved to be stable (Once fired Lapua Brass). We completed one test so far and found that some where between 32.4 and 33gr of varget is accurate. I also noticed that the neck tension (.286 bushing) we are using is robbing 25-40 fps on the chrono which is why I am interested in your bushing size.

It seems that you are having good luck with H4895. Did the charges nearly overflow the shells?

[constructor]

How far is your Chrono from the muzzle? Did you use new brass? What size bushing are you using in your die?
Apx 10' to the first, used brass, .284
The results you have posted for the 6.5BR in RE15 and H335 are similar to our peak results in new brass. Somewhere around 32.5gr of H335 our brass would "doughnut" at the bottom. We have noticed that the Amax is a faster bullet than the SMK (with respect to identical powder charges).

We see a major pressure change occur when we go the the second firing of the Lapua brass. The brass volume increases about .5gr (water) once it is once fired and the brass shows pressure signs with smaller charges (Primer craters and ejector / extractor marks). Any thoughts?
No, weird. I don't care if the primers crater a little but when they are sharp and large enough for a finger nail to hang on I stop.

The varget load you posted recently seemed to have a boring speed (2590 - 2625ish) but proved to be stable (Once fired Lapua Brass). We completed one test so far and found that some where between 32.4 and 33gr of varget is accurate. I also noticed that the neck tension (.286 bushing) we are using is robbing 25-40 fps on the chrono which is why I am interested in your bushing size.

It seems that you are having good luck with H4895. Did the charges nearly overflow the shells?

No, none of the charges filled the case above the bottom of the neck. Which makes me question yours...wonder if the Redding dies are sizing the brass smaller than what my RCBS 7mmBR dies are??

[constructor]

Going back through some old articles on 6mmBR.com the topic of neck tension with Lapua brass keeps coming up. Jason check the id of the neck on the new brass after you have used the expander mandrel to neck up, then compare that to the id after using the dies to resize...just a thought.

[constructor]

Added for the 100TTSX

18" 6.5BRX 100gr TTSX--- Max loads start low and work up
36gr H4895=3048
39gr 748=3043
37gr H335=3093

[marinesg1012]

Added for the 100TTSX

18" 6.5BRX 100gr TTSX--- Max loads start low and work up
36gr H4895=3048
39gr 748=3043
37gr H335=3093

Those are awesome numbers.

I still want a 68BRx.....

[Homebrewer]

Added for the 100TTSX

18" 6.5BRX 100gr TTSX--- Max loads start low and work up
36gr H4895=3048
39gr 748=3043
37gr H335=3093

H - Looks like I have more options to to check now..
I am heading to the range in the morning to check out my 6.5 BRX loads..
Running 123 Amax, 123 SMK, and 120 TTSX loaded over RE 17 and IMR 4895.
Also have Berger 120 loaded over RE 17.
The Oehler 35 is gonna get a workout!

Dennis

[constructor]

Those are awesome numbers.

I still want a 68BRx.....

I know, after todays testing a 6.8 BRX would just smoke everything else for pure vel. and the hunting range would still be 400+

[marinesg1012]

I know, after todays testing a 6.8 BRX would just smoke everything else for pure vel. and the hunting range would still be 400+

I think I ran the guestimated numbers before with the 110 accubond and you could easily hit 500 with it expanding and carry 800ft/lbs... the 95ttsx would go a lot further I bet...

[Homebrewer]

H - Looks like I have more options to to check now..
I am heading to the range in the morning to check out my 6.5 BRX loads..
Running 123 Amax, 123 SMK, and 120 TTSX loaded over RE 17 and IMR 4895.
Also have Berger 120 loaded over RE 17.
The Oehler 35 is gonna get a workout!

Dennis

Here are todays range results of my QuickLoad workups:
H's 6.5 BRX with 20" Krieger Criterion barrel. Firing over a Oehler 35 chrono.
Limited to 5 shot velocity averages per load.

6.5 BRX	Lapua brass	CCI #41	2.300" coal
	IMR 4895	Velocity		RE 17	Velocity
123 Amax	34.0	2742		36.3	2660
	34.4	2654		36.6	2675
	34.7	2799		36.9	2709
				37.2	2714
				37.4	2741
123 SMK	34.0	2742		36.3	2658
	34.4	2772		36.6	2657
	34.7	2797		36.9	2671
	35.0	2809		37.2	2712
	35.2	2827		37.4	2724
120 TTSX	33.5	2705		35.7	2638
	33.7	2727		36.0	2637
	33.9	2735		36.3	2649
	34.1	2762		36.6	2657
	34.3	2782		36.8	2689
120 Berger				36.9	2710
				37.2	2746
				37.5	2743
				37.8	2757
				38.0	2801
120 Nosler BT				36.9	2711
				37.2	2713
				37.5	2731
				37.8	2760
				38.0	2777

Now to drill into a few of these to check out the accuracy a little closer..