Originally Posted by
jaxman7
WS6,
I can't tell you how much of a POI shift you'll get with a can on the end but I can give you some results I had when I did a test for POI shift on my DD 14.5 LW. I keep meaning to start a thread on this or just add to Trident's thread about said barrel but just can't get the time to do it.
Distance was 100 yards. Shooting from the prone with a Harris. Rifle has a Geissele SD-C and a Leupold VX-6. Was shooting Hornady 55g V-Max and the barrel is free floated. With that said I was able to get a 10 round group 1.1"....and yes I have pics. :) Started off cold bore with that group at about 65°. Next I did a 30 round mag dump and the laser thermometer read 261° at the gas block and a little cooler just forward of the barrel nut.
Interestingly as many think my second group after the mag dump did not open up. I shot another 10 round group at 1.1". Well technically a 9 shot group. I called one of the shots. Anyway the group didn't open but the POI shifted about one inch down and right. Or an inch shift towards the 4 o'clock position. Now this is conjecture but I'd imagine you'd get an even bigger shift with a can on it. Not sure if this helps much but these were my findings.
-Jax