02-15-2020, 02:13 AM
So today's exercise was to make some loads for this new RAP using AR-Comp and, primarily, 123 SST's. Plus a few 120 gold dots. I have the RAP mounted in my LSS-xl MDt chassis. I'm getting to like it, 'course I figured I would!
I chose a load range close to others that have been successful in 16-20" barrels I have and have had, basically 27.8-28.4ish.
This Ruger I loaded ARC of 27.8, 28.0, 28.2, and 28.4, sst's at 2.265.
I also loaded 3 120 gold dots at 28.0 and 2 at 28.2 (that was the extent of ready brass I had). All Hornady brass and cci450 primers. The goldies set at 2.270
This barrel is fast. At least, to me!
SST's:
27.8: Avg 2554 SD 9.4
28.0: Avg 2558 sd 9.7. This threesome had ~0.3" clover but the magnetospeed was on the barrel so I don't really count it group-wise.
28.2: Avg 2569 sd- 20.7 (one outlier of 2593 ft/s - no idea why).
28.4: Avg 2578 sd-7.3. This group showed some definite beginnings of primer craters.
For the gold dots, the 28.0's averaged to 2617, sd 7.0, and the 2 at 28.2, for 2641 avg.
The 28.2 for these definitely have some primer craters but edges look round. I doubt I would stay at this load or go higher, probably limit myself to 28.0.
Now I don't put a lot of stock into the quoted sd's since the groups are very small, but I do think I have some potential at 28.0-28.2 for the SST and 28.0 for the gold dots.
I have my PA 4-14x44 scope on it, and like how it's performing on this rifle so far.
Makes them loads I would feel comfortable using out to 275 or maybe 300 yds if the shot and the deer were good.
as a footnote I have a couple of ASC mags inbound, due to comments from other RAP-users. (Rappers? lol!!)
I chose a load range close to others that have been successful in 16-20" barrels I have and have had, basically 27.8-28.4ish.
This Ruger I loaded ARC of 27.8, 28.0, 28.2, and 28.4, sst's at 2.265.
I also loaded 3 120 gold dots at 28.0 and 2 at 28.2 (that was the extent of ready brass I had). All Hornady brass and cci450 primers. The goldies set at 2.270
This barrel is fast. At least, to me!
SST's:
27.8: Avg 2554 SD 9.4
28.0: Avg 2558 sd 9.7. This threesome had ~0.3" clover but the magnetospeed was on the barrel so I don't really count it group-wise.
28.2: Avg 2569 sd- 20.7 (one outlier of 2593 ft/s - no idea why).
28.4: Avg 2578 sd-7.3. This group showed some definite beginnings of primer craters.
For the gold dots, the 28.0's averaged to 2617, sd 7.0, and the 2 at 28.2, for 2641 avg.
The 28.2 for these definitely have some primer craters but edges look round. I doubt I would stay at this load or go higher, probably limit myself to 28.0.
Now I don't put a lot of stock into the quoted sd's since the groups are very small, but I do think I have some potential at 28.0-28.2 for the SST and 28.0 for the gold dots.
I have my PA 4-14x44 scope on it, and like how it's performing on this rifle so far.
Makes them loads I would feel comfortable using out to 275 or maybe 300 yds if the shot and the deer were good.
as a footnote I have a couple of ASC mags inbound, due to comments from other RAP-users. (Rappers? lol!!)
"Down the floor, out the door, Go Brandon Go!!!!!"