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U/O one barrel shooting high and left??


walt1980
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A mates just shown 6 pattern plates he did today, he's been shooting a long time so not new to it all, on all 3 plates which had the top barrel fired, all high and left! Shot spread was fine, 3/4 choke, but all left and high of centre, bottom barrel, 1/2 choke, all really good and centre.

Gun is a browning 525, standard chokes, cartridges were a mix, but each was a pair. 2 X 28/7.5 4 X 30/6

He's going to swap the chokes over and see if it was them, any ideas anyone??

Plates were at about 15 yards and I would say centre of the shot group was approx 4" left and 4" high. In the plates it's in section 1 just inside the first circle. Will try and get pics tomorrow.

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Personally I think 15 yards is a bit close . There will be some rise in the shot due to ballistics and 4" in a 30 inch circle is really not much . Most O/U's I have tested with barrel mounted lasers will have the top barrel line up fairly flat and bottom barrel line up around 9" high .

Better men than me may explain the cartridges ballistics but I seem to think there is a 2&1/2 degree rise in the shot after leaving the muzzle which will peek and then drop dependent on range and velocity.

Patterning is all well and good but it can have a detrimental effect in the mental concern set in the shooters mind .

Best advice I heard was that you buy a gun and learn to shoot it .

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Shots fired aiming at the same point, could understand it if it happened once or even twice but 3 times? Hopefully the choke swap might answer it. It's a field model not a Sporter, 4" at 15 yards isn't much but most pheasant he shoots are 35+Yards, by my bad maths it works out about 10" off centre! A higher bird even more, reduces the chances of a clean kill I reckon.

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Chokes are not true, off centre.Not round.?.

As said swop them, it will tell you if its the chokes,or even the barrels not soldered parallel.

Although not a o/u, an off-centre choke was the cause of this problem on my Benelli M2. A warranty replacement barrel from GMK sorted it out.

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Best way to tell if its barrel or choke, is to put the shells away and borrow or buy a laser bore sighter, that fits in end of barrel. Clamp the gun to an unmoveable object and place laser in bottom barrel aim it at a target at a set distance of 15+ yds distance, get a helpet to mark where the laser hits, change barrels and repeat (without un clamping the gun), if it is throwing the dot way off, change the choke and try again. I have come across guns that have been mis alligned when the tubes were soldered, to the tune off 12" + to one side, so it could be either. If its just height and no side deviation it probably wont even be noticed when shooting. Did he have problems, is that why he patterned it?

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After many years of buying my first shotgun, a Lanber field model o/u multichoke, I decided to pattern it. The top barrel shot ok - slightly high, the bottom barrel shot low, but both vertically ok. I mentioned this to the dealer from where I had it years before, so way out of warranty, and he said probably barrel not soldered in correct position.

 

When shooting it now, I only use cyl or 1/4 choke in the bottom with 7's or 7.5's and 1/2 choke with 6's in the top. I have got used to " thinking " over for bottom barrel and under for top barrel, and it seems to work for me, so basically blotting out the target with the bottom barrel.

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