I have succeeded in screwing up a fine shooting gun! With no adjustments to the barrel "spacer" I had it regulated just fine. Then I decided that fine wasn't enough, I needed "perfect", so I started adjusting the barrel band, to move the POI of the lower barrel. The POI's now show crossing ie. the lower barrel shoots higher than the upper. Here is the question:
Say you want to move the POI of the lower barrel DOWN, which way do you move the barrel spacer assuming the gun is standing vertically with its butt on the ground?
Thanks, Peter.

Move the wedge back...less pressure. DO ONLY A VERY SMALL adjustment, as it doesn't take much. One characteristic of the Valmet/Tikka regulation for elevation is that the bottom barrel bends much more readily than the top and varies as to whether the top has the old Valmet full rib or just a quarter rib. On several I had I needed to regulate the barrels to shoot more or less parallel, then file the front sight to regulate the sight elevation. I had to install a very high front blade on one and file it in.

Always remember that very little wedge change makes a lot of movement in point of impact, and tightening the wedge screw causes some change, also. Don't overtighten the wedge retaining screw; they are a bit soft.

L2S, I assume by "back" you mean towards the butt. Thats what I did, without success. Wouldn't moving it "back" increase the pressure?Perhaps I moved it too much? I was trying to get 250 Swifts to regulate as well as my 270 Speers and 286 Privi's! I guess I just have to try to put it back where it was. The problem is that the lower barrel is about 6" high.
Peter.

No...back down...less pressure. Be sure to shoot the changed pressure at the wedge with the retaining screw tightened, as it makes a big difference. It is best to use an adjustable troque driver and keep the torque the same every time you re-tighten. Regulating is frustrating until you get the touch; then, its easy, remembering very minor changes in pressure make significant change.

I once made a similar screwup (hmmn...adjustment...yeah, that's it) on my 412 combination gun.

On the combo guns the spacer (or whatever we call the widget attached to the lower rifle barrel) moves along an inclined ramp attached to the upper shotgun barrel.

Sliding the spacer along the incline so that it (hence the middle of the lower barrel) moves toward the upper barrel causes the lower tube to shoot lower.

Sliding the spacer along the incline so it moves away from the upper barrel causes the lower barrel to shoot higher.

...I think.

Good luck.

quote:

Sliding the spacer along the incline so that it (hence the middle of the lower barrel) moves toward the upper barrel causes the lower tube to shoot lower.

Sliding the spacer along the incline so it moves away from the upper barrel causes the lower barrel to shoot higher.

...I think.

That's the problem! Moving the spacer "down" the incline means moving it towards the muzzle and that is the opposite of what I have been told. I think! I don't have it in front of me. I suspect that I have the instructions right, but that I over did it, and by doing so, moved the regulation of the upper barrel.
Peter.
Peter.

OK, another question. Is the barrel "band" ie. the semicircular piece that holds the upper barrel meant to be attached rigidly to the upper barrel? I think it shoud be. Mine moves. I can see the "shiny" place on the upper barrel where it should be. Should it be soldered there? What happens now is that when I attempt to slide the lower barrel attachment to the "ramp", the semi circular band moves as well. I am trying to keep it in place but I suspect that this might be "a" problem if not "the" problem.
Peter.

quote:

Originally posted by Peter:
Is the barrel "band" ie. the semicircular piece that holds the upper barrel meant to be attached rigidly to the upper barrel? Mine moves. What happens now is that when I attempt to slide the lower barrel attachment to the "ramp", the semi circular band moves as well. I am trying to keep it in place but I suspect that this might be "a" problem if not "the" problem.

Mine was only the combo gun so YMMV but it seems to me one of the widgets has got to stay put. You may have found THE problem.

OK, I had a local gunsmith (lead) solder the offending part back on. At the range, the two rounds are about an inch or two apart at 50 yards, but ARE crossed, so, I am back in the regulation business. I need to lower the POI of the lower barrel.
Peter.

Peter,
Here the page from the owners manual on barrel adjusting. Hope that helps
OOOOOOOOOOOOOOOOOppppps sorry it is so big

Thanks Foxfire. I have that somewhere. I need to relook at it before I make any adjustments! Rearward means (to me) towards the receiver end. Don't want to screw it up again.
Peter.