Author Topic: .270win dropping 6 inches at 200 yds???  (Read 1178 times)

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Offline SeaBass

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.270win dropping 6 inches at 200 yds???
« on: November 10, 2004, 06:35:19 AM »
I zeroed my Weatherby Vanguard in .270 Win to shoot just over 1 inch high at 100yds. According to Remington's data it should be close to dead on (<1" low) at 200yds. This is with Remington premier 130 accutip boattails. The muzzle velocity is supposed to be 3060fps. All information was from a 24" barrel which is what I have.

At 200yds the POI is almost 5 inches low. The groups are good. 1" at 100 and 2.5 at 200 on a rather windy and snowy day.

Could this be a scope parallax issue?

It was pretty much the same with 130gr core-lokts.

Oddly enough when I zeroed 150gr core-lokts 2" high at 100yds they were dead on at 200 just like the Remington data said they would be.

I'm going to zero the 130 accutips 2" high at 100 tomorrow and see where they are at 200.

What do you think the problem is?   Thanks.

Offline jvs

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.270win dropping 6 inches at 200 yds???
« Reply #1 on: November 10, 2004, 09:27:26 AM »
You may have a rate of twist issue when it comes to 130 gr.
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Offline dave284

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.270win dropping 6 inches at 200 yds???
« Reply #2 on: November 10, 2004, 03:00:37 PM »
SeaBass, with 2.5' groups at 200 I wouldn't think it to be a parallax problem, although I don't know what the problem is. Were you by some chance shooting into a strong headwind, even that would have to be awfully strong for that much drop. Was everyting consistent in your form.  I'm thinking it would be a combination of things.  Velocity not as advertised (they surely wouldn't fudge advertised velocities would they :wink: ), headwind, form, maybe even just an "off" day, some parallax.  Try again. If you get the same results then try actually sighting in at 200 and see where that puts you at 100.

 Good Luck,
  Dave.
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Offline Iowegan

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.270win dropping 6 inches at 200 yds???
« Reply #3 on: November 10, 2004, 03:53:23 PM »
If you have access to a chronograph, try a few rounds and see what velocity you are getting. Scope parallax will cause considerable cross hair drift problems at close distances but shouldn't drift much at distances beyond 100 yards. If you have an AO adjustment, make sure it is set to the right yardage.

If your groups are decent, (looks like they are) then twist rate and bullet stability isn't the issue. If you see oval or worse yet keyholes in your target, then you have a stability problem.

I'm betting on the wind or overstated manufacturer's specs.
GLB

Offline SeaBass

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.270win dropping 6 inches at 200 yds???
« Reply #4 on: November 11, 2004, 05:55:11 AM »
Well' I'm not sure what the problem was.  I fired 3 rounds and they were right on 1" high at 100yds.  I brought it up 4 clicks and the next 3 shots strung up to 2" high at 100.  I fired a few more at a fresh target (letting the barrel cool between shots) to make sure my scope had settled in. Then moved to 200yds.  A click right and a click down and it's 1" high at 200 and 2" high at 100yds.  I thought maybe I had forgot to adjust my objective but it didn't seem to make alot of difference when I played with it today.  Go figure.

Offline PA-Joe

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.270win dropping 6 inches at 200 yds???
« Reply #5 on: November 11, 2004, 07:35:26 AM »
I sight most of my guns to be 2 inches high at 100.

Offline safetysheriff

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.270win dropping 6 inches at 200 yds???
« Reply #6 on: November 11, 2004, 12:55:07 PM »
Quote from: SeaBass
Well' I'm not sure what the problem was.  I fired 3 rounds and they were right on 1" high at 100yds.  I brought it up 4 clicks and the next 3 shots strung up to 2" high at 100.  I fired a few more at a fresh target (letting the barrel cool between shots) to make sure my scope had settled in. Then moved to 200yds.  A click right and a click down and it's 1" high at 200 and 2" high at 100yds.  


Like you said, "....what the problem was."     2" high at 100 yds', and then 1" high at 200 yds' sounds like a 225 yd' zero to me......with some cartridges and with some scope heights.    

I'd check for POI variations when changing powers on the scope, and remember that you also made "sure my scope had settled in."    That's important, too.

Whose scope are you using, and what model?

SS'
Yet a little while and the wicked man shall be no more.   Though you mark his place he will not be there.   Ps. 37.

Offline SeaBass

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.270win dropping 6 inches at 200 yds???
« Reply #7 on: November 11, 2004, 08:46:02 PM »
safetysherrif,
  You are pretty close on the zero I think the "book" calls it 229yds.  That is basically what I set out to do today.  

2" high@100, 1" high@200, 1" low@250 at 300 it should be 4.6" low.

I could have went with 3" high at 150 and 3" low at 300 but I'm going to limit my shots to 200yds this season so I'm not too worried what its doing at 300.  

The scope.... Well it's a Tasco 4-16x40AO.  The optics are very clear and bright.  Overall it's been a good scope but it seems to like it take a shot for the adjustment to fully take.  If I bring it 4 clicks up @ 100 the first shot will be 1/2" high then the 2nd and 3rd will be 2" high. (oops I meant 1 inch)  But we are only talking a 1/"2 at 100yds which could very easily be me.  It seems like the scope is settling but maybe I'm the one settling in. :lol:   It's never off far enough for me to blame it.  After adjusting it today I shot a 3 round group at 200yds that measured < 1.5 inches so all is well at the moment.

I was at 16x the whole time today.  I may have been at different powers last time I'm not sure.  That's not a pleasant thought though.  I keep it on 4x most of the time when hunting.  The extra power sure is nice for checking antlers at long range though.

Offline gunnut69

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.270win dropping 6 inches at 200 yds???
« Reply #8 on: November 12, 2004, 04:54:30 AM »
Paralexx, what the front ring on the scope adjusts, is really just the focal plane of the reticle.  Reticles are only in focus at one distance and at that distance they are 'paralexx free'.  When a scope has paralexx is when the target and the reticle focus are at differing distances.  The groups get bigger because a slight change in the shooters head alignment will alter the place on the target where the reticle seems to be.  Paralexx will make the groups bigger but has only a minimal effect on where the groups goes.  Altering the power(magnification) can alter the group on the target.  In cheaper scopes the lenses are not always perfectly concentric and altering the power level can have the shooter looking thru a different part of the lens.  This can alter the groups impact on the target.
gunnut69--
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Offline Coal River Rat

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groups
« Reply #9 on: November 12, 2004, 05:21:58 PM »
There is a possibility that the ammo you were shooting was not up to the advertised velocities, I know it's a stretch that a company would do that sort of thing, but it could happen. :lol: . Different people are bothered by different things, but I got to tell you that a scope settling in after you adjust it would bother me alot. Some of the less expensive scopes will change the POI when you change the power setting.  I didn't see where you said what kind of mounts you're using, anyway the 1st thing I would do is get a better scope, something along the lines of a VXII, Nikon Monarch or the Burris Fullfield II(around 200-250 bones). All these scopes are in the med. type price range and are a real good deal considering the quality of optics, features, tracking and warranties for the price. I'm not running down Tasco, I know they are a good value for the money, but if your looking for consistant, repeatable accuracy, good glass and strong mounts are a must. Your rifle will only be as good as your scope. The scope is the one thing that is between your rifle and your target. IMO the scope and mounts are the last place to cut costs.  Just my 2 cents.

Offline handirifle

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.270win dropping 6 inches at 200 yds???
« Reply #10 on: November 18, 2004, 07:32:03 PM »
seabass
On the crosshair settling issue.  I had some scopes in the past like that.  Make your adjustments and give the adjustment turret a couple light taps with the handle of a light screwdrive or similar.  Nothing heavy or hard just something to "shock" the movement system.  Tap like you were tapping the side of a wine glass.
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Offline SeaBass

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.270win dropping 6 inches at 200 yds???
« Reply #11 on: February 13, 2005, 06:46:24 PM »
The scope was the problem.  Wasted much time and ammo.  That was my last cheap scope. :evil:

Offline Al in Md

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.270win dropping 6 inches at 200 yds???
« Reply #12 on: February 14, 2005, 05:22:56 AM »
Tasco has always been good for one thing,Using them as a club to finish off any wounded quarry.Thats about it.

Offline longwalker

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bullet point of impact
« Reply #13 on: February 17, 2005, 11:06:40 AM »
Firearms are dynamic devices. Not all guns shoot all ammunition the same way. This is because of bore size variations, barrel thickness and taper. Bullet size and style and powder. All these things work together along with your part trigger pull.

The reaction that is started when the sear is released is fast and dynamic. Your barrel moves in wave like motion, it could very well be that the barrel is in a downward swing when that particular load hits the muzzle.

It seems to me that you are doing your part, your reported groups are good. You have tried different ammunition and found better results. Keep trying different ammunition you will find the load that works best for your gun.

Or save your brass and reload. You will quickly find a load combination that shoots consistent and predictably.

longwalker