6.5 Grendel

bobke

Sergeant
Sep 17, 2010
588
7
18
65
Tx Hill Country
#3
123 Nosler CC/Sierra HPBT/Scenars, 120 Scenar L
31.5-31.7 CFE, CCI 41/RP 7 1/2
2.26-2.285, depending on distance to lands and variable magazine length and feeding reliability.
2525 in 18” Lilja or JP, 2550-2575 in 20” Bartlein, 2650-2675 in 24” Satern.
All quite accurate and generally low ES/SD, depending on brass and brass prep. Very forgiving to load for.
 

.30kal

Sergeant
Jun 24, 2011
171
5
18
San Jose, CA
#4
Bullet: 123 gr Scenar
Powder: 28.0 gr of AR-COMP:
Brass: 1x-fired Lapua
Shoulder: 1.215" (fired expands to 1.219")
CBTO: 1.714"
Neck: .288 Bushing
Primer: CCI 450
Velo through 18" Larue barrel: 2492 FPS
SD: 2.6
 
Mar 5, 2017
22
0
1
Houston,Tx
#5
Looks like I'm going first.

20" Odin Works 1/8" twist barrel
CCI 450 primer
Hornady brass
28.8grs XBR8208
123gr Hornady SST
2582fps 2.1 SD
Sub .5 MoA
Damn that load seems a bit over the max to me. Are you seeing any pressure signs? I have loaded XBR in 3 grendel barrels now and at 28.5 grains I started seeing serious pressure.
 

bobke

Sergeant
Sep 17, 2010
588
7
18
65
Tx Hill Country
#6
BDog
Great numbers, but would agree that load is about .3gr above what is generally considered max over on Grendel forum. Betting brass and primer pockets don’’t hold for long either. Of course, everyone’s barrel and chamber are different. To those unfamiliar with Grendel, certainly wouldn’’t recommend that as a starting load, and suggest slow work up from 28.0, paying attention to distance to lands along the way.
 
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Niles Coyote

Gunny Sergeant
Aug 13, 2007
3,664
68
48
South West, MI
#7
My go to load is 26.8 grains Ar-Comp in Lapua brass under a 123 Scenar or ELD seated 2.245-2.250.

16" Ballistic advantage light weight mid-length gas= 2363 SD-5 ES-13
5 at 500
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"https:\/\/i.imgur.com\/bLJ4Zdp.jpg"}[/IMG2]

18" JP light contour rifle gas= 2440 SD-5 ES-17
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"https:\/\/i.imgur.com\/s5UfuOU.jpg"}[/IMG2]
20" Precision Rifles (bartlien barrel) rifle gas = 2460ish and the SD/ES were good but I'm unable to find my notes right now.
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"https:\/\/i.imgur.com\/q8CcBiH.jpg"}[/IMG2]
 
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Apr 25, 2014
715
126
43
Boise, Idaho
#8
Damn that load seems a bit over the max to me. Are you seeing any pressure signs? I have loaded XBR in 3 grendel barrels now and at 28.5 grains I started seeing serious pressure.

No case head deformation. Primers are slightly flattened, still rounded on the edges. I've seen a handful or so of loads at the same charge as mine give or take a bit, posted on various forums. So I didn't think anything of it. I have no idea what max "book" pressure is. I start low and work up till I find a good accurate load that the rifle likes.

Not worried about brass life. My buddy shoots this round in factory Hornady and gives me his brass. I already have about 800 pieces between what I bought and what he gives me. Plus I'm just not seeing any signs that these rounds are over-pressured. Every rifle is different.

I haven't had any issues with it. I haven't tried running it with my can though.
 
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Niles Coyote

Gunny Sergeant
Aug 13, 2007
3,664
68
48
South West, MI
#9
While i suspect not many will play with 100 grain Amax, I have a box and decided to burn some imr8208 today in my 18" JP barrel.


POI and velocity, there definitely appears to be a node at 30.0 grains and possibly a step or two above where I stopped at, 30.8

If you can't see the velocity readings they are as follows:
30.0= 2712 SD-3 ES-7
30.2= 2733 5/10
30.4= 2742 9/19
30.6= 2775 14/26
30.8= 2782 15/28

If OCW theory holds, +3% of 30.0 = 30.9 so next time out I may try 31 grains, but given the numbers and group at 30.0... thats very tempting to remain there.
 

padom

SuperMod
Staff member
Mar 13, 2013
6,004
205
63
Southeastern, Pennsylvania
#10
While i suspect not many will play with 100 grain Amax, I have a box and decided to burn some imr8208 today in my 18" JP barrel.
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"https:\/\/i.imgur.com\/suRRkIjl.jpg"}[/IMG2]

POI and velocity, there definitely appears to be a node at 30.0 grains and possibly a step or two above where I stopped at, 30.8

If you can't see the velocity readings they are as follows:
30.0= 2712 SD-3 ES-7
30.2= 2733 5/10
30.4= 2742 9/19
30.6= 2775 14/26
30.8= 2782 15/28

If OCW theory holds, +3% of 30.0 = 30.9 so next time out I may try 31 grains, but given the numbers and group at 30.0... thats very tempting to remain there.

what's your COAL roughly? And what is your max COAL with say a 123 Amax or 123 ELDM touching the lands?

edit:
I see st the top of your target it says 2.245 COAL...How far off the lands are you?
 

Niles Coyote

Gunny Sergeant
Aug 13, 2007
3,664
68
48
South West, MI
#11
what's your COAL roughly? And what is your max COAL with say a 123 Amax or 123 ELDM touching the lands?

edit:
I see st the top of your target it says 2.245 COAL...How far off the lands are you?
Padom, I seat all my bullets between 2.245-2.250

I am not sure how far the 100 A-max is from the lands, I just loaded them to what was printed in the hornady manual, 2.245-2.250. The 123 ELD is jumping about .030" and the Lapua Scenar 123 is jumping about .060".

 
Feb 17, 2014
55
7
8
#12
20" Proof Research carbon fiber barrel
Hornady once fired brass
CCI #41 primer
123gr Lapua Scenar loaded to 2.260 COAL (1.721 off Hornady ogive gauge)
27.6gr AR COMP
2485-fps ES:10 SD: 4.5 over 10 shots

10 shot groups are around .6 consistently for me at 100 yards.
 
Mar 15, 2017
10
0
1
#14
This just arrived...


Velocity testing 107 loaded to 2.258, this leaves them jumping .097" in my JP's chamber. 18" barrel, rifle gas.


will punch some paper next.
Have you had an opportunity to target test these loads? I'm very interested in the 6.5G and this bullet in particular.

~J
 

Maddy

New Hide Member
Mar 6, 2018
21
1
3
Urbandale, IA
#19
I'll check my records when I get home. I worked up a load with 8208 as well. I'll let you know what it was. I found I got better velocity and accuracy in my rifle with the CFE223.