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Posted: 4/23/2008 11:45:44 AM EDT
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I've got an Outback II that I have used on a number of handguns. Accuracy is excellent and I would argue that I have better accuracy with the can on. However, I was at the range today sighting in my latest purchase, a Ruger Charger that I had threaded for my Outback. I sighted it in with an A2 flash hider (my thread protector) and a red dot scope. Everthing was running well and at 33' I could put five shots in a penny. However, once I switched add the Outback my shots dropped four inches down. Same ammo (Remington Sub-Sonic), same mag, same bipod, etc. I took the can off, screwed it back on to ensure everything was on correctly and same story. I then put the can on my Mosquito host and it ran flawlessly...... Any ideas what could be causing my shots to drop 4" at 33'? |
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POI shift is pretty common when installing a can. Some gun/can combos show very little POI shift, while others have an excessive amount. I have a can for my MAC10. On the MAC, it doesn't seem to make much difference. If I put that can on anything else, there is a dramatic POI shift. I've noticed this especially when putting that can on an Uzi, or on an AR15/9mm pistol. A different can on those guns has almost no POI shift. Either sight the scope to use with the can on or off. Or learn to compensate when the can is on. Does the gun still shoot small groups with the can on? Just hitting in a different spot? If so, there's not much that you can do about it. OTOH, of the group has opened up significantly, you may be getting baffle strikes, in which case your threading might not be centered up on the bore of the barrel. |
i am interested to hear more. I have a charger with a bull barrelled butler creek 10/22 barrel that i had threaded and shortened by ADCO. I actually saw no movement of impact with the can on/off. pic 
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Do people see a POI shift on a particular gun? When the Charger was first threaded, the threading was too tight and I could only get the Outback halfway on. I took it back and they re-threaded it and it fit fine. Other than that, everything seems fine. I just can't imagine a POI shift of 4" and 33'...that's pretty significant. At any rate, I'll take it back to the range this weekend and retest. |
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I had a minor POI shift with my 10/22 at longer ranges. solution? I dont plan on ever shooting the gun without the suppressor so its sighted in accordingly. IMHO the Charger is "too big" of a gun to just plink for no reason. might as well shoot with the suppressor every time. |
In my (limited) experience it is more dependent on the can. As I noted above, I have a large subgun can that gives large POI shifts on most guns, while another can has very minimal POI shifts on the same guns. Most .22 cans tend to have very limited POI shift, as the cans are generally pretty light and short. Again, the OP might want to check and see that he's not getting baffle strikes. |
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I'd agree sometimes, especially with a tighter bored can, you can get just the right circumstances where a port in a baffle causes some significant shift. As long as group size is similar I would not worry. It's when the group size changes and shots are erratic that you probably have something to fix. |
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