6mm arc 90g Sierra TGK
- Thread starter supercorndogs
- Start date
Not 90 but I did 95 TMK
Seekins 6 ARC 18” Shaw SS barrel, Omega can
Magnetospeed V3
3/22/23
55F 59% 30.31 in
Sierra 95 gr TMK
Lever
Hornady brass x 1
BTO 1.6580
COL 1.4900
28.5 2517, 2545 SD 19.7 1” group
29.0 2623, 2629 SD 4.2 0.4”
29.5 2677, 2669 SD 5.6 0.6”
30.0 2705, 2711 SD 4.2 1”
4/22/23
59F 82% 29.83 in
*2x fired brass
30.0 2733, 2759, 2770, 2764, 2756 SD 14.1 30.5 2798, 2799, 2802, 2814, 2814 SD 8.0
Seekins 6 ARC 18” Shaw SS barrel, Omega can
Magnetospeed V3
3/22/23
55F 59% 30.31 in
Sierra 95 gr TMK
Lever
Hornady brass x 1
BTO 1.6580
COL 1.4900
28.5 2517, 2545 SD 19.7 1” group
29.0 2623, 2629 SD 4.2 0.4”
29.5 2677, 2669 SD 5.6 0.6”
30.0 2705, 2711 SD 4.2 1”
4/22/23
59F 82% 29.83 in
*2x fired brass
30.0 2733, 2759, 2770, 2764, 2756 SD 14.1 30.5 2798, 2799, 2802, 2814, 2814 SD 8.0
Here’s 58 VMAX I finally got data on.
Seekins 6 ARC 18” Shaw SS 1:7.5
Magnetospeed V3
7/16/23
84F 56% 29.88 in
Hornady 58 gr VMAX
A2230
Hornady brass x 5
205M FGMM
BTO 1.6650
COL 1.4900
31.0 3335, 3339, 3332, 3317 SD 9.6 1” no pressure
31.3 3393, 3377, 3413, 3389, 3408 SD 14.5 0.8” (4 0.5”) no pressure
31.6 3416, 3431, 3416 SD 8.6 0.8”
31.9 3444, 3426, 3412 SD 16.0 1.25” no pressure
32.2 3468, 3466, 3474, 3476 SD 4.6 0.5” x 3 no pressure
32.5 3507, 3506, 3497, 3506 SD 4.6 1” mild pressure
7/27/23
89F 53% 30.11 in
Hornady 58 gr VMAX
A2230 32.5
Hornady brass x 5
205M FGMM
BTO 1.6650
COL 1.4900
3501, 3494, 3496, 3486, 3503 SD 6.6 1” (4 were 0.5” mild pressure
3501, 3494, 3496, 3486, 3503,
3500, 3512, 3505, 3496, 3518 SD 9.1 1.4” (6 were 0.7”)
Seekins 6 ARC 18” Shaw SS 1:7.5
Magnetospeed V3
7/16/23
84F 56% 29.88 in
Hornady 58 gr VMAX
A2230
Hornady brass x 5
205M FGMM
BTO 1.6650
COL 1.4900
31.0 3335, 3339, 3332, 3317 SD 9.6 1” no pressure
31.3 3393, 3377, 3413, 3389, 3408 SD 14.5 0.8” (4 0.5”) no pressure
31.6 3416, 3431, 3416 SD 8.6 0.8”
31.9 3444, 3426, 3412 SD 16.0 1.25” no pressure
32.2 3468, 3466, 3474, 3476 SD 4.6 0.5” x 3 no pressure
32.5 3507, 3506, 3497, 3506 SD 4.6 1” mild pressure
7/27/23
89F 53% 30.11 in
Hornady 58 gr VMAX
A2230 32.5
Hornady brass x 5
205M FGMM
BTO 1.6650
COL 1.4900
3501, 3494, 3496, 3486, 3503 SD 6.6 1” (4 were 0.5” mild pressure
3501, 3494, 3496, 3486, 3503,
3500, 3512, 3505, 3496, 3518 SD 9.1 1.4” (6 were 0.7”)
Rifle is all JP except for the barrel which is a 22” bartlein pulled out of a GA Precision 6 ARC.
103 ELDX Horn
1 x fired Horn factory brass
28.6gr CFE223 (max in Horn book, might try pushing this a smidge)
CCI BR-4 primers
My only grip is SD and ES are still not great. I’ve been able to get sub- 10 SDs with this powder charge but idk what is going on there… any comments on lowering SDs would be appreciated… I know that’s a broad ask but a man can hope.
5 shot groups on the top and a 2 shot confirmation after going long. Below is the group I got at 630yds.
If you have access to Leverevolution powder you can get about 100-150 fps more probably. I have an 18” barrel on my Seekins. Caution though because the pressure spiked on these loads at 89F and 1x fired Hornady brass a couple weeks ago. Other indices were the same. I’ve backed off but just wanted to see what I could pull.
4/24/23
60F 41% 30.13in
Hornady 103 gr ELD-X
Lever
Hornady brass x 3
205M FGMM
BTO 1.6730
COL 1.4900
30.5 2743, 2751, 2759, 2748, 2758
SD 6.7 1.25” no pressure
31.0 2791, 2779, 2792, 2794, 2805
SD 9.2 1” (4 0.6”) no pressure
I actually switched away from Lever because of temp stability and larger SDs… like 18-19, but maybe I was missing something. I did love the speed. And I have switched to a much better scale so that might help with the SD part…
My ARC is a 22" Criterion barrel fitted to a Savage, it has a bit more freebore than normal, I can comfortably seat 103s at 2.34 " without any jam. I'm running Starline Grendel brass trimmed and resized. Imr 8208 Fed 205s. Just on 50 rounds fired.
Today I shot a 8208 load I'd worked up to previously but found patchy, which I think was my scales (common theme here?). Group was .375 for the 5 at 2746 fps. Job done really, a pretty hot load, shooting awesome. But I also tried some Leverevolution and got it up to 2910 fps shooting a ladder. No pressure signs from brass, rifle or primers BUT when I ran that load in Gordon's Reloading Tool (GRT) it was pretty certain that it was running at 75,000psi. - oh shit! I mention this because this is the second instance with this cartridge when the pressure has gone sky high without showing it in the brass or primer. Might not pay to push the limits too far!
Today I shot a 8208 load I'd worked up to previously but found patchy, which I think was my scales (common theme here?). Group was .375 for the 5 at 2746 fps. Job done really, a pretty hot load, shooting awesome. But I also tried some Leverevolution and got it up to 2910 fps shooting a ladder. No pressure signs from brass, rifle or primers BUT when I ran that load in Gordon's Reloading Tool (GRT) it was pretty certain that it was running at 75,000psi. - oh shit! I mention this because this is the second instance with this cartridge when the pressure has gone sky high without showing it in the brass or primer. Might not pay to push the limits too far!
There is a 6mm arc load data thread. There is no need to clutter this up with a bunch of off subject load data.
I was shooting the 90 TGK out of a 20 inch proof bolt gun. Ran it with 31.3 of LVR and 30.6 of CFE223. It shot pretty good with both. I ended up using a load with the 87VLD instead. Will revisit these as I bought quite a few.
I tried .15 .20 and .25 of the lands. It shot best long at 2.268 which is .25 off. 31.2 of LVR at 2942FPS
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That is the TGK sorry. The Berger VLD is at
2.21COL CBTO is 1.590 for the VLD and 1.592 for the TGK. Both shoot great.
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