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MOA How much internal adjustment .308 Cal

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2009 at 23:15
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With a  .308       how many MOA of internal adjustment do you need to shoot targets 100yds to 1000yds..?

Edited by Urimaginaryfrnd - May/26/2009 at 10:27
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 06:12
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 I gotta run in a minute or two, but your bottomed -out- but- still five high at 100 will give you a zero much farther out than 250 yards.
 
I'll explain when I get back...l
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 07:10
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5 moa high at the bottom would zero you  at 335 yards approx.
A very slow 175 at 2550 uses 39.25 moa at 1000 asl and 41 moa at sea level on a 70 degree day, just for a point of reference.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 11:15
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Originally posted by Mike McDonald Mike McDonald wrote:

5 moa high at the bottom would zero you  at 335 yards approx.
A very slow 175 at 2550 uses 39.25 moa at 1000 asl and 41 moa at sea level on a 70 degree day, just for a point of reference.
 
I was thinking around 350 yards or so, just off the top of my head, but I shoot a 30-06, so I think Mikes estimate is probably dead on.
 If you can figure out a mounting system to get the bottom to zero close to exactly to point of aim at 100 yards, then yes, you should be able to crank 50 MOA up from that to get to over a thousand yards. 
 Keep in mind that you'll be at the 'edges' of the best optical performance, though.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 11:40
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 Incidently, the reason your theoretical plus 5" @ 100 yards doesn't pan out to an approximate  250 yard point of impact, is because the 4.4 inches of drop shown in your table is the amount of drop between 100 and 200 yards. If you elevate the muzzle to hit 5 inches higher at 100, you have in effect raised it 10 inches at 200 and 15 inches at 300.
  It also hasn't taken into account the divergent angle of the line of sight caused by having the scope mounted 1.5 inches above the bore, unless I'm misreading the chart.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 14:27
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Got ya.
Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 14:39
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 What scope do you have Wes?
 It seems to me you were waiting on a Trijicon recently?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 17:22
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TR23R


Edited by Urimaginaryfrnd - May/26/2009 at 10:28
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/21/2009 at 19:54
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PHOTO #0
 See how the lines of the post do not seem to have eaven thickness or something that makes them not appear razor sharp as straight lines.  

Edited by Urimaginaryfrnd - May/26/2009 at 10:30
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 09:53
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Where this thing really seems to be useful is at night.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 13:54
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 It is a little out of focus, so it's hard to tell...but the lines appear slightly uneven.
Does the triangle come to a decent point on top?  That's what I would consider essential for fine accuracy with that reticle
 
I wonder if the lines are wires or optic fibers "feeding" power to the triangle?
 
Also, how well does the reticle dim down when you close the gate?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 17:00
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  I am a little disconcerted by the lines of the post not being a consistent width they kind of look like a  6 yr old drew them on there with a ruler and pen.  

Edited by Urimaginaryfrnd - May/26/2009 at 10:29
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 20:02
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 I don't see why they even try to make it appear as two lines that close together. You really can't see anything useful in the thin space between them. It would be just about as functional if they had designed it as a solid post, and they could probably at least make it straight if they did. (It would hide the glue smear, too!)
 It reminds me of the reticles on the Falcon tactical scopes, with the parallel twin lines.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 21:13
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Well it makes me wonder what the mildot looks like.

Edited by Urimaginaryfrnd - May/01/2009 at 08:59
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 21:31
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 As far as the elevation is concerned, I wonder if you could make up some kind of adjustable base to make it work. ( Perhaps something on the order of Al Nyhus' Benchrest rig he posted recently,)  Shouldn't be too hard for a talented machinist to rig something solid and workable. It wouldn't even need to have more than two positions, high and low.
Perhaps an old  Leatherwood system could even be modified to your scope.
 If I had a lathe and a mill, and some tooling, and some skill, and more time, I'd get right on it!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2009 at 22:57
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You mean like so:
3DSMT Leatherwood Tactical 3D Mount                                                                                           Leatherwood Tactical 3D Mount
SWFA: $419.95
More Info... Buy Now
 


Edited by Urimaginaryfrnd - May/01/2009 at 09:00
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 06:52
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The Leatherwood 3D mount has some great capability but you must be willing to accept a significant weight addition.  It does have a full 100 MOA range (up el) and can be boresight zeroed in az.  With a little practice it is a VERY fast way to dial varying ranges.  I have not yet completed the testing I started with it, but found it to be "dead on" from 100 to 500yds mounted on a 30-06 BAR/BOSS with rapid fire 3-shot groups averaging 1/2MOA or less.  It IS heavy, if that matters to you.  I have not tried hunting with it, but if I can pull away from the .458, intend to this year (the .458 draws me to it like the Dark Side of the Force). 
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 07:47
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 Wes, actually I wasn't even aware that the Leatherwood system existed in any form other than the complete base/scope with the eccentric cam on the tube of the Leatherwood scope. I proposed the possibility of modifying one of those.
 The base you posted, and Kickboxer commented on, is pretty close to what I envisioned when I suggested having a machinist custom-build an adjustable base for you from scratch, although it's more sophisticated than I figured you to need.
 If you can live with the weight, I doubt you'd ever find a better solution if you want to use your Trijicon at a half a mile, as well as spitting distance.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 08:46
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Wes, sorry to hear of the difficulties of a new product; I been there, done that!

As an owner of the 3-9x40 with the same reticle, I can say that the lines below the reticle "should" be parallel, mine are and it is a nice effect - though its utility is questionable.  It does draw the eye to the triangle quickly.

Also, at night, on hogs, the reticle is the nutz!  The tritium keeps the triangle illuminated enough to see in darkness but not so much as to wash out the target.  For no-spotlight nights with near- or full-moon, it is my hands-down favorite reticle: no switches, no batteries to die, point and shoot, literally!

I'm curious about the knobs, reticles can be fixed, glue smears SHOULD be fixed, bad knob design is bad knob design.  Are the clicks consistent and clear?  Are the well defined near the extremes?  Have you box tested it yet?  How easy is the scope to get behind?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 09:13
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 I agree with Rancid that the reticle should be cleaned up by Trijicon, and at no charge to you.
 That glue spot and crooked wire issue  is simply unacceptably sloppy work in a thousand-dollar scope. I wouldn't accept it in a two-hundred dollar scope, for that matter. Too many good scopes out there to let that fly without complaint.
 
The limited travel in elevation is your problem though, unless you specifically asked about it before buying, and they lied about it having more MOA elevation than it does.


Edited by RONK - April/23/2009 at 09:17
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 09:51
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The scope has not been mounted and is still in the box.  

Edited by Urimaginaryfrnd - May/26/2009 at 10:31
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If the smudge doesn't bother you and doesn't obscure the triangle, keep it.


If it were me, I'd write Trijicon, tell them they screwed up, tell them to send a new scope and you will decide, once the new one is in hand, which to send back.  If they want this brand new scope to do well, initial reports need to be good - and this one ain't!

I've considered buying the same scope - that plan is on indefinitely hold till I hear that they treat you right.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 10:08
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The glue smear is a bit odd but not nearly as troubling as the lines of the post not having uniform width.  It's like they are drawn on by hand and when you look through it for any extended length of time it it makes the post not look straight. 

Edited by Urimaginaryfrnd - May/26/2009 at 10:31
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2009 at 10:55
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PHOTO #1  5x outside  here it looks really funky like its not straight lines.

Edited by Urimaginaryfrnd - April/24/2009 at 10:50
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 PHOTO #2 20x from inside looking out you can see that lower illumination gives a sharper point to the triangle.  Here it looks like a barber pole.

Edited by Urimaginaryfrnd - April/24/2009 at 10:49
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