doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Cast check - POI change

Anyone that has moved POI with stock adjustments...I need a sanity check.

My brother-in-law has a sxs Sarasqueta 20g that has a fair amount of cast off. The right barrel hits way left for him. The left barrel is about spot on.

If I bend the stock to the left, toward 0 cast, will the right barrel tend to shoot more to the right?

Speculators are welcome, but I'd sure like to hear from someone that has done it too.

OK, I'll speculate. Have you checked the trigger pulls? If the right barrel hits left, it could be due to a heavy trigger.

JMO, I think it's too consistantly left to be the trigger pull. Granted, I'm not shooting it and I have not pulled the trigger on it in quite some time. Whether it's fired very diliberately aimed or from a low gun mount and shoot, it is very consistantly left.

I'd think it might be barrel regulation....if it's not a change of ammo might solve your problem.

jOe, I know what you're saying and given the stock configuation and the shooter, the right barrel is pointed too far left. OK, I agree it's a regulation issue...with the stock the way it is and with this shooter. The question is: can a stock cast change make it a non-issue? If it were a simple regulation issue, I would think I could get the two barrels hitting equally from the aiming point...then if the barrels needed to be spread or narrowed to hit on, it would straight forward.

If it's a barrel regulation issue, changing the cast will change the POI of both barrels. You can't change the POI of one barrel only by adjustments to the stock. Bending the stock from "cast off" to neutral will move the POI to the left for both barrels.

If the left barrel is spot on, and trigger pull on the right barrel is not an issue, you might want to consider letting Briley put choke tubes in the right barrel only that will alter the point of impact. I think they call them "eccentrix" choles or something like that. I had to do that with an AYA recently for the same problem.

Anyway, my two cents.

Hack

There are I think two aspects to consider here. As Hack has said reducing the cast will tend to make the gun point more to the left. On the other hand changing the pivot point (shoulder contact) to the left will tend to make the gun shift more to the right in firing. Which of the two will hav the greater effect is hard to say & in either case will affect both bbls.
I am assuming though the owner thinks he can live with the existing seperation, just wants to have the "Center" of the two impact zones on aim rather than to the left side.

Hi Chuck:

It is a barrel regulation problem that can be corrected for about $70.00!

Of course this is just seculation but I draw on my past experiences!

Good luck,

Franchi

How so ?

No arguement. I agree. But sighting down the rib at a target should result in both barrels hitting equadistant from the aiming point, IMO. Then I could successfully adjust regulation of the crossfiring




My theory is that it will move POI right.



Certainly a POI can be changed by an eccentric choke. But there are almost always more than one way to do something. If the barrels are straight and the chokes bore correctly, my feeling is that it would be a stock issue that the POIs are not the same distance from point of aim. Any crossfiring or opposite would be a convergence regulation issue, IMO.


Miller, I thought I'd get it shooting the same for each barrel first, then either deal with the crossfiring by one of a few methods or decide if it's acceptable.

I'm aware of methods of working a choke by hand to one side or the other. I'm not eliminating that, but I'd like to get this asymetric POI issue assessed and addressed first.