Update:
Different barrel:
125 rounds down it before testing.
7SS
150 Freebore
32" Bartlein
1:8.7 5R
All loads:
COAL= 3.082~
0.010" in the lands
184gr Berger hybrids. Unsorted
ADG brass. Fired twice. Annealed every time. Neck turned
CCI BR2's
Fire forming load:
120gr Hornady Vmax
Jammed in the lands.
59.0gr RL23
3200ish FPS
No pressure signs. Sharp shoulders.
With a formed case you can get these V-max's easily to 3630 FPS with H4350.
DO NOT SHOOT AR500 steel at 100yds.
Velocity testing only.
2 rounds fired at each charge and averaged
Magnetospeed
H1000
62gr = 2975 FPS
62.5 = 2996
63 = 3006
63.5 = 3039
64.0 = 3059
H4350
52.5 = 2823
53 = 2834
53.5 = 2856
54 = 2877
54.5 = 2897
RL23
57.9 = 2989
58.2 = 2986
58.5 = 3002
58.8 = 3015
59.1 = 3026
No real pressure signs with H1000, max charge before compressing.
H4350 had a stiff bolt lift on one of the two rounds fired at 54.5.
The higher charges of RL23 resulted in a stiffer bolt lift. RL23 was a more narrow window because I've worked with it in the past.
Hope this helps someone in the future.
Different barrel:
125 rounds down it before testing.
7SS
150 Freebore
32" Bartlein
1:8.7 5R
All loads:
COAL= 3.082~
0.010" in the lands
184gr Berger hybrids. Unsorted
ADG brass. Fired twice. Annealed every time. Neck turned
CCI BR2's
Fire forming load:
120gr Hornady Vmax
Jammed in the lands.
59.0gr RL23
3200ish FPS
No pressure signs. Sharp shoulders.
With a formed case you can get these V-max's easily to 3630 FPS with H4350.
DO NOT SHOOT AR500 steel at 100yds.
Velocity testing only.
2 rounds fired at each charge and averaged
Magnetospeed
H1000
62gr = 2975 FPS
62.5 = 2996
63 = 3006
63.5 = 3039
64.0 = 3059
H4350
52.5 = 2823
53 = 2834
53.5 = 2856
54 = 2877
54.5 = 2897
RL23
57.9 = 2989
58.2 = 2986
58.5 = 3002
58.8 = 3015
59.1 = 3026
No real pressure signs with H1000, max charge before compressing.
H4350 had a stiff bolt lift on one of the two rounds fired at 54.5.
The higher charges of RL23 resulted in a stiffer bolt lift. RL23 was a more narrow window because I've worked with it in the past.
Hope this helps someone in the future.