Author Topic: how to adjust sights on vent rib barrel  (Read 381 times)

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Offline mb4859

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how to adjust sights on vent rib barrel
« on: September 08, 2009, 12:14:13 AM »
Is there a way to adjust the sights on a 14" 45lc/410 Barrel?  It has a round bead on the front and a non flip-up rear sight that slides left and right in a dovetail groove.  How do you adjust elevation?
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Offline Hopalong7

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Re: how to adjust sights on vent rib barrel
« Reply #1 on: September 08, 2009, 06:58:57 AM »
     Your options are few and not easy.  My first suggestion would be to try to adjust your sight picture to a finer or courser bead to move shot impact up or down which ever is appropriate.  About the next easiest option would be shortening(filling down)your existing rear blade or replacing with a taller one.  There were some 10" .410/.45Colt barrels made with the pistol front blade and fully adjustable rear sights also.

Offline Dezynco

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Re: how to adjust sights on vent rib barrel
« Reply #2 on: September 08, 2009, 03:21:24 PM »
 To adjust elevation, you can use a taller or shorter front sight bead.  Go down to the local gun shop or 'smith and have a shorter bead installed to move the point of impact up (you'll be raising the muzzle to draw a bead), a taller bead to move the point of impact down (you'll be lowering the muzzle).  The little beads are about $5.00 installed.

You can also try using "heavier" or "lighter" loads in your barrel.  "Heavier" loads (that move the bullet faster) will shoot lower.  Lighter loads will shoot higher.  This is because the slower the bullet leaves the barrel, the more you have moved up and down when it comes out of the barrel.  The slower the bullet/lighter the recoil - the higher it hits the target because the muzzle has risen more as the bullet leaves the barrel.

Are you following me?  I know that sounds bass-ackwards - it seems that the more a gun kicks, the higher the bullet should hit the target - but the converse is actually what happens (generally speaking).  There's actually a "curve" that happens that correlates bullet weight/velocity if you plot it on a sheet of graph paper.

It's a little hard to explain, but I'll give you an example...my Ruger Mark II shoots great with 36 grain hollow points, but shoots high with 40 grain solids.  Basically the powder charge is the same between the two different cartridges.

Offline mb4859

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Re: how to adjust sights on vent rib barrel
« Reply #3 on: September 09, 2009, 01:45:22 PM »
I shot another #4 buckshot yesterday.  It has 5 shots in each shell.  I shot it at 20 yards.  2 were 10" out at 3 o-clock, 1 was 10" at 5 o-clock, 1 was 9" at 7 o-clock and 1 was 18" at 10 o-clock.  I left the choke in and I'm still wondering if I should take it out for buckshot.  It patterns the 3" remington #6's great at 20 yards.  46 shot in a 9" paper plate.  There were only 20 #6's in the plate at 20 yards with AA's in 2-1/2".  I want to try some #8's now.  Still having fun trying to decide on the next barrels.  22lr 10" for sure and probably 44mag 10" for my deer/hog barrel.  Just can't wait.
Politics is supposed to be the second oldest profession. I have come to realize that it bears a very close resemblance to the first.
- Ronald Reagan