I went and patterned my new XT today and it is shooting to the left but dead on. I shot at 35 yards i figured that is about where I shoot my birds at. The comb is straight right now it is adjustable but not for sure which way to move it? A friend said I should be shooting high but I don't think so at 35 yards. Maybe at 13. I need it to hit a little more to the right. However when I mount the gun the back bead is a slight bit to the right if I were looking at both beads but it is in the center of the rib. I put Briley chokes in it and was shooting the top barrel with IM tube.
James, you have a little more work to do before you know what you have.
It is unfortunate that many factory choke tubes do not shoot to the same POI. Browning and Beretta are particularly bad in this regard. When i got my Beretta combo, only 2 of the six choke tubes supplied shot to the same POI.
He is my suggestion. Set up on a bench and shoot at a target set somewhere between 13 and 20 yards away. I use a grease plate at 20 yards, because that is the most convenient at the clubs I frequent.
Set up on a rest and sight your shotgun just like it was a rifle. Put a tube in the top barrel and fire for POI. Fire enough times that you can say with confidence, this tube prints x high and y right. Now do exactly the same thing with the next tube, and the next, until you are done. Separate out the tubes that shot to the same POI and discard the rest. BTW, for this test it is not important where they print, only that they print to the same POI. You are trying to determine where your gun/barrels/choke tubes shoot, not where you shoot it.
Now take one of the known good tubes and put it in the bottom barrel and shoot for POI. If it hit the same spot as the top barrel, you are good to go. If not, your barrels are not converged and you'll have to decide what to do about it. Many people can live with 1" or 2" misconvergence. 4" is a lot. I've seen as much as 8" difference.
Once you have determined you gun shoots straight with the good choke tubes, you can find out where you shoot it. 35 yards is too far away. Tey something between 13 and 16. Stand just like you do on the line and fire at your mark. To make adjustments, move the comb in the direction you want to go. If you want to move your shot placement to the right, move the comb to the right.
Vertical POI is best set while shooting targets. I'd recommend you start with your gun shooting 1" high at 13-16 yards and adjust from there as needed.
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