Hello all, and thanks for helping me learn a lot.
I have found a great load for the 120 sst in 6.8, and since it seems like there is very little info on the spc II, I thought I would share it.
To get to the point, 120sst 31.3 grn AR comp, just over 2,700fps with great accuracy.
The full details, using a AR15, 16" AR15performance barrel, 1:11 twist 5 groove, this load requires a good bit of compression, I use a drop tube to get things started more densly, I use multiple fired SSA brass. (the Fedral brass will not load enough powder for this). It is important to note I use an OAL of 2.330". This requires a mag that is cut out for a longer length. Similar speeds with nearly as good accuracy were produced many times with a Daniel Defense barrel in the same length with a 10:1 twist 6 groove.
The best groups shown were too hot to continue with, but the lowest two loads should prove plenty accurate with more attempts. Interesting to note, that the first signs of pressure I ran into were similar to swipes, but were more impressions of the ejector hole. no swiping. Perhaps the powder responds differently because it is slower? also the hot loads 31.5 through 31.9 failed to increase speeds.
200 fps faster than the 110 prohunters.
I believe this gives over 1000 ft/lbs for 350 yds.
And this was with an $80 Pentax scope I took apart and repaired myself.
I have found a great load for the 120 sst in 6.8, and since it seems like there is very little info on the spc II, I thought I would share it.
To get to the point, 120sst 31.3 grn AR comp, just over 2,700fps with great accuracy.
The full details, using a AR15, 16" AR15performance barrel, 1:11 twist 5 groove, this load requires a good bit of compression, I use a drop tube to get things started more densly, I use multiple fired SSA brass. (the Fedral brass will not load enough powder for this). It is important to note I use an OAL of 2.330". This requires a mag that is cut out for a longer length. Similar speeds with nearly as good accuracy were produced many times with a Daniel Defense barrel in the same length with a 10:1 twist 6 groove.
The best groups shown were too hot to continue with, but the lowest two loads should prove plenty accurate with more attempts. Interesting to note, that the first signs of pressure I ran into were similar to swipes, but were more impressions of the ejector hole. no swiping. Perhaps the powder responds differently because it is slower? also the hot loads 31.5 through 31.9 failed to increase speeds.
200 fps faster than the 110 prohunters.
I believe this gives over 1000 ft/lbs for 350 yds.
And this was with an $80 Pentax scope I took apart and repaired myself.
