Grrrr! 629 Mountain Gun always groups low

[FunYet]

My S&W 629 4" Mountain Gun shoots very tight groups. However, they always hit below my point of aim. At first I thought it was due to my reloads but I've tried it with quite a few different factory loads such as 180 gr .44 magnum and 240 gr. Come to think of it, the same occurs when shooting .44 Special. I've also tried the same samples of ammo in a 5" 629 Classic and shots are always dead on. Never ran into this with a handgun before.

I've lowered the rear sight as far as possible. My sight picture has the top of the front sight lined up with the top of the read sight.



Any ideas?

 

[Bill B.]

I changed out the front ramp sight on my Smith & Wesson 45 ACP Mountain Gun to a Patridge type. There are several different heights available from Brownells on both the patridge and the ramp sight. Simply go with a little shorter front sight and that should take care of your problem.

 

[RCL]

Try raising the rear sight.

 

[JNewell]

No, he's got it right. Front-opposite, Rear-same (direction you want to move the bullet on the target. If he's shooting low, he needs to raise the front or lower the rear. If the rear is all the way down, it's time for a taller blade.

 

[MLH]

I agree with RCL

I've always raised the rear sight to raise the POI.

 

[Master Blaster]

Shortening the FRONT sight will raise the point of impact.

Raising the rear sight will raise the point of impact.

HE NEEDS TO RAISE THE REAR SIGHT.

It works the same on every gun I have ever owned.

 

[Guns_and_Labs]

Unless he's holding it sideways, gangbanger-fashion.

 

[treeprof]

As already stated, it's move the rear sight in the direction you want the point of impact to move, opposite on the front. Quite intuitive if you think abt it, but see also here:


http://www.eohc.ca/sighting.htm

http://www.aeroballisticsonline.com/ballistics/sightadjustment.html

http://www.steyrscout.org/zeroing.htm

http://www.bobtuley.com/external.htm

 

[FunYet]

Doh!

Smacking self in head>

I feel stupid. I had it backward. I guess I can return that new grinding wheel to Sears I'll give it a try.

Thanks!

 

[carebear]

Think of the line across the top of the sights as being level (which it be should while firing), when you adjust the sights, that line stays level. Now you can picture (or just hold the gun up in front of you) the effect of the sight movement on the bore line of the gun.

If you are cranking the rear sight up, picture the bore line pivoting on the tip of the front sight. The rear of the gun is lowering away from the "level sight line" and thus the bore line (out the muzzle) is angling more and more above the sight line. Cranking the rear down raises the rear of the gun relative to the sight line and has the muzzle pointing level or downward. (your case in point)

You can do the same when trying to figure out what to do about moving the front sight. Just figure out what happens to the bore line as the sights stay level to one another.

edited to add: in after the head smack It's one of the least obvious obvious things out there. I do a lot of holding the gun up in front of me.

 

[Bill B.]

I agree with RCL also ........... I never noticed FunYet was adjusting the rear downward,I just read the part where he said he was out of adjustment. He could get there by going to a lower, smaller front blade but it would be a "lot" easier to raise the rear!

 

[JNewell]

Oops, RCL was right...and what I said about front-opposite/rear-same was right...it was just my comprehension that was a leeetle off. Be glad I'm not in aviation...! :banghead:

 

[mnrivrat]

LOL !

Sorry guys ! I was reading this one and realized I am not the only one that gets those senior moments !

God ,it's good to know we're all allowed to fuzz out sometimes !

Raise that rear sight !