6.5 Grendel

Birddog6424

Sergeant
Belligerents
Apr 25, 2014
946
412
69
Boise, Idaho
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
 
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bobke

Sergeant
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Sep 17, 2010
669
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Bandera, Texas
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
Belligerents
Jun 24, 2011
243
76
34
San Jose, CA
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
 

6.5MMLRShooter

Private
Belligerents
Mar 5, 2017
11
0
2
Houston,Tx
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
Belligerents
Sep 17, 2010
669
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Bandera, Texas
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
Belligerents
Aug 13, 2007
4,055
433
189
South West, MI
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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Birddog6424

Sergeant
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Apr 25, 2014
946
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Boise, Idaho
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
Belligerents
Aug 13, 2007
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South West, MI
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
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Southeastern, Pennsylvania
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
Belligerents
Aug 13, 2007
4,055
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South West, MI
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".

 

Brosome

Machinist
Belligerents
Feb 17, 2014
51
13
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.
 
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Niles Coyote

Gunny Sergeant
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Aug 13, 2007
4,055
433
189
South West, MI
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.
 

JBMills

Private
Belligerents
Mar 15, 2017
8
0
2
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
 

Niles Coyote

Gunny Sergeant
Belligerents
Aug 13, 2007
4,055
433
189
South West, MI
Have you had an opportunity to target test these loads? I'm very interested in the 6.5G and this bullet in particular.

~J
Okay but not great. Dots are 1"... going to explore some slightly lower charges and 28.6 next. If that doesn't tighten things up I'll try 8208.

 
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Maddy

Private
Minuteman
Mar 6, 2018
29
6
6
Urbandale, IA
My load is: 30.7gr CFE223, 123Amax/Eld, Hornady brass, 2.245 COL, Rem 7 1/2 primer. 2550fps from 24" barrel. 1/2"-3/4" @100yd
 

Maddy

Private
Minuteman
Mar 6, 2018
29
6
6
Urbandale, IA
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.
 
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Kenknu260

Private
Belligerents
Mar 20, 2017
7
0
2
Duluth, mn
This is my daat from this weekend. Still have to decide on the load 6-7 looks like a good start point
24" 1:8
Tac
107 smk 1.56
12 2690 30
11 2653 29.7
10 2644 29.4
9 2616 29.1
8 2602 28.8
7 2546 28.5
6 2545 28.2
5 2526 27.9
4 2483 27.6
3 2437 27.3
2 2394 27
1 2373 26.7
 

bobke

Sergeant
Belligerents
Sep 17, 2010
669
63
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66
Bandera, Texas
Where’s node in terms of point of impact for loads? One round sample or multiple round average? Consistent poi for a multiple of loads a better indicator of node than two loads with similar velocity. Interested in your further results.
 

Kenknu260

Private
Belligerents
Mar 20, 2017
7
0
2
Duluth, mn
Where’s node in terms of point of impact for loads? One round sample or multiple round average? Consistent poi for a multiple of loads a better indicator of node than two loads with similar velocity. Interested in your further results.

Single round of different charges fired overy a magnetospeed sporter. I need to make up a load again to get POI but the nodes are points where the velocity, in this case, has little or no variation from one round to the next

The 6-7 node seems to be my low node but not 100% sure
 

rybe390

Private
Minuteman
Dec 13, 2017
42
16
12
18” Aero Precision barrel
130 grain Hornady ELDM
1x hornady factory brass
Cci srm
26.8 grains imr 8208xbr
2.26 oal
2370 fps

Shoots 1.05” 10 shot groups with consistency. My rifle really likes the 130 class bullets.
 

longrange454

Private
Belligerents
Sep 2, 2014
41
0
8
73
N.W. ILL.
BHW 18"
30.5 AA2520
CCI 41
Hornady brass
Hornady 123 ELD Seated at 2.285

2450 FPS
2442
2406 This ruined my string
2434
2444 SD 15.6 ES 44 AVG 2435 Consistant 3/4 MOA
 
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bobke

Sergeant
Belligerents
Sep 17, 2010
669
63
34
66
Bandera, Texas
Finally got to chrono some loads that I’ve been more focused on accuracy than speed. Worked up in 20” very short throated Satern, but had to test in equally short throated 24” Satern.
123 Sierra BTHP 27.2 AR Comp CCI41 2.23 OAL
2530/16ES/5.7SD
129 Nosler ABLR 30.2 CFE 223 CCI41 2.285 OAL
2500/17ES/9.8SD. Only had three rounds to test.
75CB910C-3595-4A51-BD0F-32094F3A122A.jpeg16D605EF-0392-4D26-813B-C4D5D7AA9BAB.jpeg
 
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Shadow_Warrior

Sergeant
Online Training Access
Belligerents
Jul 14, 2004
201
41
34
Tulsa Ok
Built two 6.5 Grendel's on AR-15 platform
18" Christensen Carbon Fiber barrels
123 ELD
CCI 450
XBR 8208 27.8gr
2.250" OAL
 

bfglowkey

Sergeant of the Hide
Belligerents
Minuteman
Aug 14, 2018
177
91
34
Hunting loads I have for my 20" Howa 1500 SA

129 Hornady Interlock
24.8 G 8208XBR
Hornady 1x Fired Brass
CCI 450s
2205 FPS ( expands out to 215 yds and could push it faster with XBR but the grouping is insane)
Grp size is ludicrous at 0.22 MOA (4 different shooters all shooting 3 shot groups)

123 Hornady SST
28.1 AR Comp
Hornady 1xFired Brass
S&B Small Rifle Primers
2540 FPS
0.75 MOA

Not worried about SD/ES with hunting loads since they wont be used past 200 yds.
 

GrendelShooter

Private
Online Training Access
Belligerents
Jul 9, 2017
16
2
6
Behind enemy lines, Ca
18” Aero Precision barrel
130 grain Hornady ELDM
1x hornady factory brass
Cci srm
26.8 grains imr 8208xbr
2.26 oal
2370 fps

Shoots 1.05” 10 shot groups with consistency. My rifle really likes the 130 class bullets.
I’m hoping mine does too.
20” Grendel forum group buy barrel
130gr ELDM
Lapua brass
CCI #41
26.7-27.0gr AR Comp 2395-2403fps.

Will be testing the above node for groups this weekend. Showed zero pressure signs during velocity testing.