8.6 Blk reloading info

[db2000]

Seekins SP10 Mos-Tek 1:6.5 10.5”
Garmin Xero

11/24/24

300 gr SMK HPBT (factory seconds)
A1680
Q brass x 2
BTO 2.0130
COL 1.6805
COAL 2.759
17.0 959, 1021, 1014, 989, 1009, 1011, 1004, 1021, 1010, 1003 stable
17.5 1063, 1040, 1051, 1059, 1029, 1035, 1029, 1050, 1032, 1063 stable

Maker 350
A1680
Alpha brass new
FGMM 210M
BTO 2.4000
COAL 2.7910
COL 1.6775
16.0 910, 869 not stable @ 50
16.5 917, 918, 927 not stable @ 50
17.0 942, 959 stable @ 100
17.5 1025, 1000, 1003, 1008 not stable @ 50
18.0 1043, 1030, 1022, 1028, 1024 decently stable 50/100y

Barnes 210 GR TSX BT solid
A1680
Alpha LRP new
FGMM 210M
BTO 2.0615
COAL 2.6625
COL 1.6775
30.5 1801, 1848, 1827, 1825, 1832 SD 15.4 ES 48 MLP
31.0 1851, 1874, 1858, 1867, 1863 SD 8, ES 24 1.25” MLP

Hornady 230 ELD-X
A1680
Alpha LRP new
FGMM 210M
BTO 2.0170
COAL 2.7575
COL 1.6775
26.0 1574, 1528, 1516, 1528 NP
27.0 1581, 1591, 1596, 1582, 1591 SD 6 ES 16 1” NP

 

[st1650]

Seekins SP10 Mos-Tek 1:6.5 10.5”
Garmin Xero

11/24/24

300 gr SMK HPBT (factory seconds)
A1680
Q brass x 2
BTO 2.0130
COL 1.6805
COAL 2.759
17.0 959, 1021, 1014, 989, 1009, 1011, 1004, 1021, 1010, 1003 stable
17.5 1063, 1040, 1051, 1059, 1029, 1035, 1029, 1050, 1032, 1063 stable

Maker 350
A1680
Alpha brass new
FGMM 210M
BTO 2.4000
COAL 2.7910
COL 1.6775
16.0 910, 869 not stable @ 50
16.5 917, 918, 927 not stable @ 50
17.0 942, 959 stable @ 100
17.5 1025, 1000, 1003, 1008 not stable @ 50
18.0 1043, 1030, 1022, 1028, 1024 decently stable 50/100y

Barnes 210 GR TSX BT solid
A1680
Alpha LRP new
FGMM 210M
BTO 2.0615
COAL 2.6625
COL 1.6775
30.5 1801, 1848, 1827, 1825, 1832 SD 15.4 ES 48 MLP
31.0 1851, 1874, 1858, 1867, 1863 SD 8, ES 24 1.25” MLP

Hornady 230 ELD-X
A1680
Alpha LRP new
FGMM 210M
BTO 2.0170
COAL 2.7575
COL 1.6775
26.0 1574, 1528, 1516, 1528 NP
27.0 1581, 1591, 1596, 1582, 1591 SD 6 ES 16 1” NP




View attachment 8555243View attachment 8555244

What accuracy were you getting with aa1680 at 18gr ?

 

[45-90]

I found the 350 Maker stable at 880 fps, shot at 64 yds on the test day with a 6.5 Twist with 5.2 SD in the 338 Spectre with W 296 into 1/2".
They were good in the 8.6 Blk too at the 52 yd test distance, bullets were touching in the same hole, with the same speed when testing 8 or 9 different powders.
According to Berger twist rate calculator, your 6.5 twist should be stable at -20°, 0 altitude, and 750 fps, with the 350 gr Maker.
Maker produces a 300 gr 6.5 twist specific, along with several others, like the 165 gr supersonic expanding available...I was shooting today.