Mossberg 590A1 ghost ring issues

Ryder, This may sting a little But according to the law of physics and the encyclopedia of planes, angles and screw threads I have before me... A bead sight equipped gun can not make you shoot high/low/left/right or anything.

The reasons a blade sight can "make" you shoot inaccurately with any gun are simply lacking with either a single bead or mid barrel second bead.

The blade and ghost ring sights require the alignment of a plane between to items on the gun. Both of these items have too many variable measurements to assume you won't be shooting 2 feet high.

The bead is a "point of reference" sort of like a hood ornament on the car.

All you need to realize is the way the gun shoots at a given distance considering a consistent grip, cheek weld and shoulder placement. For instance, I can hit a pie plate 60-65 yards with my 18 inch barreled mossberg 500 cyl. choke with slugs. The plate will be exactly touching the top of the barrel and the bead will show inside the edge. For 50 yards, the plate is on top of the bead.

For thirty yards, there will be around 3/4 inch of daylight between the plate and barrel. You make the adjustments. And remember the gun has to accommodate so many loads and distances. A slug is lethal out to a hundred yards and they kill a bunch of deer every year but the same gun is just as accurate at 10 yards when you compensate as you must. You just have to know your gun these varying distances.

Brent
 
Get the one with the bead sight like I did and your slugs will be hitting 2 feet high at 30 yards
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I'm new to shotguns, so when I first shot my 18.5" 590A1 I was shooting extremely high too. I found it was uncomfortable to get a low enough cheek weld and sight picture with the bead. I finally decided to install a set of ghost ring sights, not just because of the more precise sighting system, but because the ghost ring is slightly raised off the receiver and more comfortable and natural to use.
 
Ryder, This may sting a little But according to the law of physics and the encyclopedia of planes, angles and screw threads I have before me... A bead sight equipped gun can not make you shoot high/low/left/right or anything.
Click to expand...

Oh, but they can and do affect the elevation of your POI with slugs, particularly between 25 and 75 yards. That is precisely the reason you will see some bead-sighted riot guns with a platform or ramp under the bead. I've had issued scatterguns--always w/o that ramp--that shot a foot and a half high at 50 yards.

I suspect this relates to the amount of taper in the barrel, but cannot state that as undisputed fact. I also suspect most manufacturers eventually figured this out and have adjusted accordingly.

The bead on the aforementioned Maverick is fairly tall by shotgun standards, stepped, and it has a very small bead on top. The above target was shot using only that tiny bead showing above the center of the sighting plane on the receiver. Had I just thrown the gun up and held the whole bead up, my 50 yard shot would have been high, maybe over the shoulders.
 
There's a big step down from the receiver to the barrel. I center the bead on the receiver using it as a rear sight. Haven't measured it yet but that step down is likely close to a quarter inch. Would be less of a factor on a long barrel, mine's only 18".

The gun hits dead on if I shoot instinctive so it's not a pressing issue but I'll probably raise that bead eventually.
 
Sarge has it right. Beads mounted directly to the barrel oft cause slugs to shoot way high from POA. A base under the bead is a quick fix. Or, use Kentucky elevation.
 
I reckon it is the "Kentucky Elevation" technique I have always used... Heck even with a cheap .22 that lacked the elevation step thinghy was lethal on birds, squirrel and rabbit as a kid.

Brent
 
590a1 test firing.

Having received it back from Mossberg after warranty work because of a low POI issue I took it to the range today. I shot at 25, 50, and even 100 yards using Brenneke 1 oz. slugs. With the ghost ring elevation almost to the bottom it was right on at 25 yards and gave me a nice tight group. i raised the sight a little and took the target out to 50 and fine tuned it in at that range and was pleased with the POI and accuracy. After that out to 100 yds and i used an IDPA practice target but didn't adjust the sights, i just aimed high enough. The ghost rings, too me, are about out of their league at that distance but i still got all of my shots in the kill zone.

With standard Winchester 9 pellet 00 it gave me decent patterns at 25 and 15 yards. At 25 yards i fired a 5 rd box of the 00 and all 45 of the pellets were inside the silhouette of the IDPA target. Not real consistent patterning but at least they were all in.
15 yard patterns were noticeably more concentrated.

Mossberg has come through very well on this and I'm very happy with the results.
:) :) :)
 
I have never been happy with the slug groups I shoot with my 590's ghost ring. More vertical stringing than I would like. I am not blaming the gun.

For me, that sight setup is for buckshot and at that, it excels.

I am glad Mossberg got yours straightened out.
 
Yeah, that big aperture isn't very conductive to tight groups at ranges over 25 yds. I was shooting the slugs off of the bench today just to get an idea of the capabilities of the gun and I had to be particularly careful with the sight picture to get decent groups.
 
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