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<blockquote data-quote="H82bogey" data-source="post: 222070" data-attributes="member: 1372">I have a question, but let me set up the scenario.Shooting a rem 308, vortex viper, factory ammo.&nbsp; Went out and sighted my scope in after changing the base plate.&nbsp; I'm not the worlds greatest shooter and was pretty windy, but was shooting 1 to 1-1/2&quot; groups at 100.&nbsp; This was done without the can.&nbsp; Went home, cleaned said rifle and put away.&nbsp; Went back the next week.&nbsp; Took a couple shots to warm up, same group as the week before.&nbsp; Then I attached the suppressor, which had been fully cleaned.&nbsp; My point of impact at 100 shifted completely off paper!&nbsp; So I checked&nbsp; to make sure it was threaded on tight and it was.&nbsp; Took a couple more shots, same result.&nbsp; Not on paper.&nbsp; Moved it back to fifty yards, took a couple shots and again off paper.&nbsp; I didn't have anyone with me to give me an idea where I was hitting, but messed around and found if I held 5 Mil's low at 50 yards I could punch paper and was also 3&quot; right of center.So my question is, what would cause this much of a POI shift?&nbsp; I haven't had a chance to take the can apart and check for impact on the baffles.&nbsp; My knowledge on this subject is limited and my online research helped me understand barrel harmonics better, but I still don't see how adding a suppressor can change it that much.&nbsp; Suppressor was screwed on tight and was clean.&nbsp; Without suppressor groups were fine at 100.&nbsp; I do have a heavy barrel so not sure my harmonics would be off enough to completely throw my accuracy out the window.&nbsp; Any insight is appreciated.Thanks in advance.</blockquote>

[QUOTE="H82bogey, post: 222070, member: 1372"] I have a question, but let me set up the scenario. Shooting a rem 308, vortex viper, factory ammo. Went out and sighted my scope in after changing the base plate. I'm not the worlds greatest shooter and was pretty windy, but was shooting 1 to 1-1/2" groups at 100. This was done without the can. Went home, cleaned said rifle and put away. Went back the next week. Took a couple shots to warm up, same group as the week before. Then I attached the suppressor, which had been fully cleaned. My point of impact at 100 shifted completely off paper! So I checked to make sure it was threaded on tight and it was. Took a couple more shots, same result. Not on paper. Moved it back to fifty yards, took a couple shots and again off paper. I didn't have anyone with me to give me an idea where I was hitting, but messed around and found if I held 5 Mil's low at 50 yards I could punch paper and was also 3" right of center. So my question is, what would cause this much of a POI shift? I haven't had a chance to take the can apart and check for impact on the baffles. My knowledge on this subject is limited and my online research helped me understand barrel harmonics better, but I still don't see how adding a suppressor can change it that much. Suppressor was screwed on tight and was clean. Without suppressor groups were fine at 100. I do have a heavy barrel so not sure my harmonics would be off enough to completely throw my accuracy out the window. Any insight is appreciated. Thanks in advance. [/QUOTE]

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