Went out again and reshot my original experiment, this time focusing at 50m a more reasonable PCC range and something I feel more confident in personal accuracy.
Previous Post
Reddit thread
I wanted to test how much POI/POA impact shifts at range when you utilize the takedown of the Ruger PC Carbine 9mm. My written experiment was supposed to go like this
The rifle will be tested by first determining the group size, and point of impact on a 12x12 paper target set up 50m away. The rifle will be fired from the sitting position using a bench rest. 5 strings of 10 shots will be fired to establish a baseline of accuracy After the 5 strings, the rifle will be taken down and the barrel separated from the receiver. The barrel will be reattached and another 5 strings of 10 shots fired. This procedure will be repeated 3x for a total of 200 rounds fired.
What I actually tested as I didn't bring enough targets, because when I started the experiment shooting at 100 m I couldn't actually see the red squares on the 4 corners of my target and had to aim at the middle of the target.
1 string of 5 rounds fired at 50 m to verify my personal zero. 1 string of 5 rounds fired at 100 m where I realized I can't see anything and adjusted my test 2 strings of 10 rounds fired at 100 m aiming at the center of each target; after each string of 10 I took the rifle down and waited 1 minute.
So first off my Ruger PC Carbine in 9mm, in the Magpul backpacker stock using the Glock Magwell adapter. This rifle is also the Canadian edition sporting a 18.6" barrel, I used a primary arms MD-25 red dot with 2 MOA red dot.
Same experiment, different results. TL;DR any shift was imperceptible to bad accuracy or equipment limitation.
(1) was 50m zero verification 5 rounds 1-2 inches low.
(2,3,4,5) 4 target and takedown strings. 5 rounds on each red corner target but takedown cycles were conducted on each half top half/bottom half.
A takedown cycle being 10 shots fired (2-5 round strings at 2 red squares), the rifle disassembled, waiting 1 minute reassembling and racking the bolt 3-5 times as per the manual.
An interesting outcome that the experimental data was 1-2 inches off from the control but all of them were similar. A potential possibility that the control string shots wasn't a good string of shots.
but I would personally conclude though that
at 50m there is no perceptible difference in accuracy in utilizing the Ruger PC Carbine takedown feature as 1-2 inch shift isn't something to worry about considering 9mm ballistics and the fact that the red dot used is 2 MOA which at 50m is approximately 1 inch target coverage which can explain any difference in point of aim, point of impact.