Nature Boy
Member
- Joined
- Apr 21, 2015
- Messages
- 8,256
I've been back to the range 3 times after originally posting this and results are still inconsistent. Apologies for the following data overload.
One piece of advice given was particularly interesting: Finding your natural point of aim. I've incorporated that into my pre-shot routine
To rule out the load, I went back and did a full ladder test following the method outlined on accurateshooter.com using 168g AMAX, Varget, 210m primers and Lapua brass. I got off the bipod and onto a shooting bag and shot the test at 200 yards (don't have a 300 yard lane). Everything shot in round robin fashion. Charge weights as noted below.
First 10 shows why 300 yards is recommended. Hard to discern the vertical dispersion due to velocity changes at 200. The squares on the target are 1" So without the flyer and with charges ranging from 41.9-44.6 that's 1 MOA.....but this shows why a statistically significant sample size is important
Completing the test resulted in this dogs breakfast of a target, however, coloring the tips of the bullets, combined with the chrono data allowed me to say there was a potential node at #6 (43.1) and #7 (42.8), which correlates to shot #4 and #5 on the chrono list
So yesterday I loaded up a bunch with 43.1g and my high hopes were dashed when nothing grouped better than 1.5" at 100 yards. I'm suspecting something may be out of whack with the rifle. I'm going to clean the barrel really well to rule out any fouling, shoot it one more time, then I'll have the gunsmith look at it for bedding issues or a barrel problem.
One piece of advice given was particularly interesting: Finding your natural point of aim. I've incorporated that into my pre-shot routine
To rule out the load, I went back and did a full ladder test following the method outlined on accurateshooter.com using 168g AMAX, Varget, 210m primers and Lapua brass. I got off the bipod and onto a shooting bag and shot the test at 200 yards (don't have a 300 yard lane). Everything shot in round robin fashion. Charge weights as noted below.
First 10 shows why 300 yards is recommended. Hard to discern the vertical dispersion due to velocity changes at 200. The squares on the target are 1" So without the flyer and with charges ranging from 41.9-44.6 that's 1 MOA.....but this shows why a statistically significant sample size is important
Completing the test resulted in this dogs breakfast of a target, however, coloring the tips of the bullets, combined with the chrono data allowed me to say there was a potential node at #6 (43.1) and #7 (42.8), which correlates to shot #4 and #5 on the chrono list
So yesterday I loaded up a bunch with 43.1g and my high hopes were dashed when nothing grouped better than 1.5" at 100 yards. I'm suspecting something may be out of whack with the rifle. I'm going to clean the barrel really well to rule out any fouling, shoot it one more time, then I'll have the gunsmith look at it for bedding issues or a barrel problem.
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