Sniper Country Duty Roster collective wisdom


Parallax?


 have a 3X9 Redfield Golden Five Star that is probably parallax-adjusted at 100 yds. At
200 yards, and at all power settings, the parallax is quite apparent. It looks like the
crosshairs are moving about 2" (at 9X), and is much more pronounced on the vertical
crosshair.

Lacking an external adjustment for it, is there any way to "dope" parallax?
Greg <gbras@ptd.net>
Palmyra, PA USA - Thursday, September 17, 1998 at 19:58:10 (EDT)


Greg: If your Redfield scope was focused for any distance between 100 to 400 yards it
would not have two inches of parallax at 200 yards. I assume you mean that as you move
your eye across the exit pupil of the scope, the reticle appears to move two inches on the
200 yard target.

The only way the parallax can be different for the vertical and horizontal wire is if they
aren't in the same plane which says the reticle is damaged. It's almost impossible that it
could be a problem with the lenses or an alignment problem and it can't be a problem in the
optics after the reticle. You could still use it by carefully centering your eye on the scope,
but if it's damaged it probably won't hold zero under recoil and you won't have confidence
in it.

Unfortuantely it appears that the scope division of Redfield has gone bankrupt, so I don't
know how you can get it fixed. The Leupold 3-9x40 tactical is a nice replacement for $300.
They'll fix it for free if it breaks, which it probably won't.

Lou Boyd <boyd@apt2.sao.arizona.edu>
Patagonia, Arizona USA - Thursday, September 17, 1998 at 23:18:22 (EDT)



 
Greg - You're lucky if you are only getting a couple of inches movement. When you settle
on the weapon move your head side to side and make sure you are in the middle of the
movement. If the movement is more on one side of the target than the other, then find
middle and place that point on the target. I used that trick for years with the fixed focus
scopes of yester years. I still have the habit of rocking my head on the scope slightly to
check parallax.

Rick <RBowcher@aol.com>
Fayetteville, NC USA - Thursday, September 17, 1998 at 23:30:31 (EDT)


Sarge, with a great look of disgust on his face, looks from his hide and PLEADS:

HELP, I'm still looking for some assistence with a .30-06 that I can't get to stay inside
2-3" at 100yds!! OK here is the data: Savage 111 (no remarks PLEASE!) with a Simmons
3x9 Prohunter scope. Weaver bases, Savage rings (hey they came with the gun). Now here
is what I've done and or checked: All the base and ring screws are tight, the action and
trigger housing screws are tight. The barrel is not touching the stock. The scope was bore
sighted prior to all this insanity. Bullet data: Sierra 165 GameKings with different loads of
N-140 and IMR 4350. Today factory Winchester both the Supreme 150's (the Nosler
Ballistic tip) and Winchester Fail Safe 165's. Rounds show no sign of over pressure, bolt
closes on a round nice and easy, extraction is right on. I'm about at what's left of my
patience!! HELP!!!! What have I forgotten, what haven't I checked, WHAT IN THE
HELL IS WRONG!! (and no cracks about it being, a Savage, PLEASE!!)
Oh, and remember, I DON'T HAVE A LOCAL GUNSMITH!!!

Sarge ducks back into his hide and prays someone has an idea what the problem can be!!
Sarge <garryrn@dfn.com>
Area 51, NM USA - Sunday, September 27, 1998 at 17:48:51 (EDT)


Sarge - Have you checked for parallax? I had the same problem when I went through the
FBI Observer-Sniper Course with an M40A1. My Unertl was focused at 300 and we were
shooting at closer than 100 yds. Couldn't get a group until I refocused.

For those of you who don't know how to do this. Rest the rifle on a solid platform about
100 yds from a defined tgt. Adjust the rifle so the crosshairs rest on tgt without you
touching it. Look through the scope without touching the rifle and move your head slightly.
The reticle shouldn't move in relation to tgt. If it does, ensure that the reticle is focused
and then if the scope has a adjustable objective make sure the target is in focus. Recheck.
If the reticle still moves in relation to the tgt and you can't focus it out it probably needs to
go to the factory. Parallax will cause a larger group becuase it is very hard for the shooter
to exactly center the eye behind the exit pupil in the same place every time. If parallax is
present you will find it hard to get the same "sight alignment" for each shot causing your
shots to wander.

How does your muzzle crown look? Free of nicks and dents?

Good luck old boy.

Gooch out.
 

gooch <kdgooch@aol.com>
Sherwood, AR USA - Sunday, September 27, 1998 at 20:13:18 (EDT)


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