Didn't find a whole lot of info when I was deciding on a cartridge/gun for a lightweight hunting rig so figured I'd post up my results. I had really wanted to push the 156 as close to 3000 fps as possible and was worried about the 21" barrel on the Seekins.
Environmentals:
85*
4700'
35% humidity
25.3 inHg
Load:
Virgin ADG Brass
Fed 210M
RL-26 - 58.0 gn (moderate pressure signs at 58.5 gn)
Berger 156 EOL
CBTO - 2.340
Everything was shot with a TBAC Ultra 7. These rounds were in the 200-250 round count area for the barrel. Accuracy for a 5 shot group hovered right around 0.7 MOA, which on such a light gun shooting a big(ger) cartridge is probably the max for my skill level. Over 10 shots the avg velocity was 2988, ES 25, SD 8.75. Which I can probably tighten up a little going through a full prep and reload process on the second firings.
Overall very excited and happy with the velo and accuracy. Trued ballistic data at 400, 500, and 1000 yards. BC was close enough for hits on 1-2 MOA targets. I'll do a little more fine tuning and get more time behind the gun before my deer tag rolls around, but sitting in a pretty good place.
Environmentals:
85*
4700'
35% humidity
25.3 inHg
Load:
Virgin ADG Brass
Fed 210M
RL-26 - 58.0 gn (moderate pressure signs at 58.5 gn)
Berger 156 EOL
CBTO - 2.340
Everything was shot with a TBAC Ultra 7. These rounds were in the 200-250 round count area for the barrel. Accuracy for a 5 shot group hovered right around 0.7 MOA, which on such a light gun shooting a big(ger) cartridge is probably the max for my skill level. Over 10 shots the avg velocity was 2988, ES 25, SD 8.75. Which I can probably tighten up a little going through a full prep and reload process on the second firings.
Overall very excited and happy with the velo and accuracy. Trued ballistic data at 400, 500, and 1000 yards. BC was close enough for hits on 1-2 MOA targets. I'll do a little more fine tuning and get more time behind the gun before my deer tag rolls around, but sitting in a pretty good place.