I've had a POF P308 for a number of years and recently took possession of an AAC 762-SDN-6 suppressor. I also bought a 51T Blackout flash hider which I installed last week after removing the factory POF muzzle brake. The factory load that has worked quite well with the POF is Remington's Hog Hammer 168gr Barnes TSX ammunition. As a baseline of sorts here's a 7-shot group from late last year at 100 yards using the same ammunition, no suppressor and the factory muzzle brake.
Here's the rifle and suppressor .... you can see the 100 yard target in the background on the right.
Here's another photo of the rifle/suppressor with a target shot a few days earlier using the same ammunition. I was adjusting the zero on that target and made a scope correction after the first (lowest) shot.
Here's the ammunition.
So now to the test. I decided to move the scope forward a bit for better eye relief but figured my zero would be close enough for the test. I planned on making some scope adjustments after the testing was completed. All rounds were loaded into MAGPUL magazines (no single feeding) and all shooting was prone off a bipod with a rear bean bag. Here's the first 3-shot group with the AAC 762-SDN-6 attached.
I put tape on the suppressor and the barrel and drew a line on both as a way to check if the suppressor would index back to the same point when I reattached it. I then removed the suppressor and shot the lower 4-shot group shown below. At first I was really surprised at the POI shift but then .... DUH
... I realized that I hadn't rotated the gas plug from S to N. I then shot the upper 3-shot group with the gas plug set to N. Bonus points to anyone who can explain why the first group with the gas plug on S shot lower than the second group with the gas plug on N.
I reattached the suppressor and shot the fourth 3-shot group.
Finally, I adjusted the elevation and windage up and right .4 mil and shot the 3-shot group on the left. I then adjusted the windage right .1 mil and shot the 4-shot group on the right. The barrel and suppressor were fairly hot during these two groups.
Conclusions:
1. The POF, AAC 762-SDN-6 and Remington Hog Hammer ammunition are an excellent combination.
2. The Hog Hammer load performs about the same using the AAC 51T flash hider or POF factory brake (not sure about POI shift between the two).
3. POI shift suppressed to non-suppressed was minimal at .352" horizontal and -.469" vertical.
4. POI shift from suppressed to reattaching suppressor was minimal with -.692" horizontal and .119" vertical.
5. "Minimal" is a subjective term. 1/2" shift at 100 yards could be very significant at 800 yards.
6. If I can develop my own Barnes 168gr load that shoots well (0.5 moa) without the suppressor, it could produce very small groups suppressed.
7. The newly converted Leupold Mark 4 3.5-10x40mm FFP M5 scope tracks well. I used the first 3-shot group to correct my 100 yard zero. I measured the vertical and horizontal offset at .4 mil using a Mark 4 40X spotting scope so came up and right .4 mil. 1.580" vertical is .44 mil and the .4 mil correction on the scope moved the center of the group to .15" above center. The windage correction isn't quite so simple since there was some wind blowing across the range but it looks like I'm close.
Here's the rifle and suppressor .... you can see the 100 yard target in the background on the right.
Here's another photo of the rifle/suppressor with a target shot a few days earlier using the same ammunition. I was adjusting the zero on that target and made a scope correction after the first (lowest) shot.
Here's the ammunition.
So now to the test. I decided to move the scope forward a bit for better eye relief but figured my zero would be close enough for the test. I planned on making some scope adjustments after the testing was completed. All rounds were loaded into MAGPUL magazines (no single feeding) and all shooting was prone off a bipod with a rear bean bag. Here's the first 3-shot group with the AAC 762-SDN-6 attached.
I put tape on the suppressor and the barrel and drew a line on both as a way to check if the suppressor would index back to the same point when I reattached it. I then removed the suppressor and shot the lower 4-shot group shown below. At first I was really surprised at the POI shift but then .... DUH
... I realized that I hadn't rotated the gas plug from S to N. I then shot the upper 3-shot group with the gas plug set to N. Bonus points to anyone who can explain why the first group with the gas plug on S shot lower than the second group with the gas plug on N.
I reattached the suppressor and shot the fourth 3-shot group.
Finally, I adjusted the elevation and windage up and right .4 mil and shot the 3-shot group on the left. I then adjusted the windage right .1 mil and shot the 4-shot group on the right. The barrel and suppressor were fairly hot during these two groups.
Conclusions:
1. The POF, AAC 762-SDN-6 and Remington Hog Hammer ammunition are an excellent combination.
2. The Hog Hammer load performs about the same using the AAC 51T flash hider or POF factory brake (not sure about POI shift between the two).
3. POI shift suppressed to non-suppressed was minimal at .352" horizontal and -.469" vertical.
4. POI shift from suppressed to reattaching suppressor was minimal with -.692" horizontal and .119" vertical.
5. "Minimal" is a subjective term. 1/2" shift at 100 yards could be very significant at 800 yards.
6. If I can develop my own Barnes 168gr load that shoots well (0.5 moa) without the suppressor, it could produce very small groups suppressed.
7. The newly converted Leupold Mark 4 3.5-10x40mm FFP M5 scope tracks well. I used the first 3-shot group to correct my 100 yard zero. I measured the vertical and horizontal offset at .4 mil using a Mark 4 40X spotting scope so came up and right .4 mil. 1.580" vertical is .44 mil and the .4 mil correction on the scope moved the center of the group to .15" above center. The windage correction isn't quite so simple since there was some wind blowing across the range but it looks like I'm close.
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