Here's my take on how to adjust the rib and comb on a gun that allows both to be moved. (I posted this earlier at the end of a long thread that I suspect no one ever read.)
First, I have noticed that I can get the sight picture I want (for me, a figure 8) just by changing how hard I push my cheek against the stock. So initially, I'll put the comb somewhere that seems comfortable and that gives me my figure 8.
Then I will shoot the gun (usually at no. 3 position, with the thrower set to throw straight-aways). I'll put the target just on top of the bead and see what happens. Let's say I get a clean miss. Next bird, I point the gun about 6 inches below the bird. Maybe I get a break that indicates that I'm hitting the top of the target. That suggests that the gun is shooting high. I'll try a few more shots with space between the front bead and the target to be sure. If I am convinced that the gun is shooting too high, I'll raise the muzzle end of the rib (which actually moves the barrel down).
Now I'll try a few more shots, with the target positioned just above the bead. Maybe I'll make some more (hopefully smaller) adjustments. When I get to the point that I'm smoking the birds (or at least getting very solid center hits) with the target sitting just above the bead, I stop adjusting the rib.
Now I'll turn to the comb, and adjust it so that I don't have to force my face anywhere. What I'm looking for is that when I mount the gun, I immediately see a perfect figure 8, without any need to "push" my face anywhere. What I want is to have the comb set up so that I automatically see the correct bead picture when I mount the gun. Every time.
Now back to the range and shoot the gun (again just throwing straights from position 3). Maybe (but probably not) I'll make minor adjustments in rib height if I'm not getting very centered breaks. And I'll adjust the comb slightly so that the figure 8 is still there without pushing (usually not necessary).
At this point, the gun points where I expect it to, and I see the desired bead alignment when I mount the gun.
This system will work for any sight picture you like and any alignment with the target you prefer, i.e., you can adjust the comb so that the rear bead covers the front bead and/or adjust the rib so that the target "floats" a certain distance above the front bead when hit in the center.
Note that this system doesn't rely on comb adjustments to change the POI - that's done by adjusting the rib. If you use the comb to adjust the POI, and then adjust the rib to get the desired sight picture, you will find that the rib adjustment has changed the POI.
Try it - you'll like it.
Ted K.
First, I have noticed that I can get the sight picture I want (for me, a figure 8) just by changing how hard I push my cheek against the stock. So initially, I'll put the comb somewhere that seems comfortable and that gives me my figure 8.
Then I will shoot the gun (usually at no. 3 position, with the thrower set to throw straight-aways). I'll put the target just on top of the bead and see what happens. Let's say I get a clean miss. Next bird, I point the gun about 6 inches below the bird. Maybe I get a break that indicates that I'm hitting the top of the target. That suggests that the gun is shooting high. I'll try a few more shots with space between the front bead and the target to be sure. If I am convinced that the gun is shooting too high, I'll raise the muzzle end of the rib (which actually moves the barrel down).
Now I'll try a few more shots, with the target positioned just above the bead. Maybe I'll make some more (hopefully smaller) adjustments. When I get to the point that I'm smoking the birds (or at least getting very solid center hits) with the target sitting just above the bead, I stop adjusting the rib.
Now I'll turn to the comb, and adjust it so that I don't have to force my face anywhere. What I'm looking for is that when I mount the gun, I immediately see a perfect figure 8, without any need to "push" my face anywhere. What I want is to have the comb set up so that I automatically see the correct bead picture when I mount the gun. Every time.
Now back to the range and shoot the gun (again just throwing straights from position 3). Maybe (but probably not) I'll make minor adjustments in rib height if I'm not getting very centered breaks. And I'll adjust the comb slightly so that the figure 8 is still there without pushing (usually not necessary).
At this point, the gun points where I expect it to, and I see the desired bead alignment when I mount the gun.
This system will work for any sight picture you like and any alignment with the target you prefer, i.e., you can adjust the comb so that the rear bead covers the front bead and/or adjust the rib so that the target "floats" a certain distance above the front bead when hit in the center.
Note that this system doesn't rely on comb adjustments to change the POI - that's done by adjusting the rib. If you use the comb to adjust the POI, and then adjust the rib to get the desired sight picture, you will find that the rib adjustment has changed the POI.
Try it - you'll like it.
Ted K.