doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Moving POI

Does anyone here have first hand experience with hiring a 'smith to move the point of impact on a fixed choke doublegun's barrels? I have a double that has .008" choke in each barrel, but "cross shoots" .......i.e., the right barrel prints 2/3 of the pattern to the left of the point of aim, and the left barrel prints 2/3 of the pattern to the right of the point of aim. Elevation is perfect on both barrels. It does this at game shooting ranges (20-25 yards, for a .410), and does so with several different loadings. No question, it is the barrels themselves that are not perfectly regulated, and not shooter error. It has been checked on different days under differing lighting conditions with the same results everytime.

How much total choke would you expect to lose in having the muzzle honed to move those patterns enough to center them? More than .002"?

I plan to call Mike Orlen about it tomorrow afternoon, but would like to hear from anyone who has ever had this issue corrected.

SRH

Right barrel w/ RIO 3" game load @ 25 yds.



Left barrel w/ RIO 3" game load @ 25 yds.



Does the same exact thing with 2 3/4", 1/2 oz. loads.

SRH

Stan, no first hand experience but you might talk to Jim Eyster at Heritage Gunsmiths. I remember a George Bird Evans story where he wrote about sending a gun to Ken Eyster to have POI changed. Jim is Ken's son and has taken over the business.

Some will claim they can hone the choke and move impact left or right....I had it done twice with little if any results.

I know that ChuckH did it himself several years ago, and documented the results on this forum, with photographs and a detailed description of the process. But, these bores are chrome lined and I wouldn't get much done in them using the process Chuck used, I'm afraid. I also want Orlen to lengthen the cones in it. Chuck also documented a huge improvement in patterns with the .410 by doing that. Orlen already told me that chrome lined bores are not a problem for him.

SRH

Stan;
Can't help with your problem there. I know that it can be done but to do so one has to "Intentionally" take more out from the side you want the pattern to move toward. If one "Correctly" just opens the choke keeping all in line then shot placement should not be changed.

What I did want to ask about though, was this just a slip up;
"Does the same exact thing with 2 3/4", 1/2 oz. loads."
I wasn't aware there were any 2 3/4" .410 shells, all I have ever seen were either 2�" or 3". Well I have seen a few Very Old 2" ones.

It was a long time ago, but Jim Eyster once told me he could move POI about 2" max by altering the choke, I think.

Reminds me of a shotgun that has compensation for recoil built in.

My experience with having chrome lined barrels ground was so poor, I'd think long and hard about it.
At least you can do the math to get an idea of how much equals how far, for the cost of a pencil.

Briley makes eccentric screw-in chokes to change poi. I have known of some success of a few folks filing screw-ins to move poi, but that involves replaceable, screw-ins, not factory chokes. Gil

My mistake, Miller. i did mean to say 2 1/2" shells. Thanks for catching that.

SRH