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How important is an adjustable objective?

 
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  #1  
Old 05-15-2008, 07:37 AM
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Join Date: Apr 2007
Posts: 39
How important is an adjustable objective?

I will be going on a Utah LE bull elk rifle hunt this fall. I know I'm darn lucky to have drawn the tag and that is why I want to do everything I can to prepare.
My question is how important is it to have and adjustable objective for elk hunting out to 700 yards? I have a 338 win mag with a leupold 2.5-8x, it shootsgood but not great yet about 1". I also have a 30-06 that shoots very well Accumark, it shoots 168 gr barnes tsx bt 3020 fps as good as I can shoot and 180 accubond very well also.
How much better would I be likely to shoot at 500-700 yards with 16x top end and adj. obj. compared to 8-10x top end and no adj obj? Thanks for any help.
Ps I already have a 4200 elite 4-16 x40 and am thinking about the elite 6500 scope also.
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  #2  
Old 05-15-2008, 07:54 AM
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Join Date: Aug 2007
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you wont be able to be accurate with eather gun out to those ranges without an adjustable objective or a side focus. you need those to take the parallaxal out of the scope.when you look through your scope at a target past about 400. leupold sets there scopes to 150 yards at the factory. the crosshairs move when you arnt moving the rifle.

-set you gun up on a target so it doesnt move
-lift your head of the cheek piece
-look through your scope and move your head around
-you will see the crosshairs move without moving the gun

if you have an adjustment you can get it so you dont have any crosshair movement.
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  #3  
Old 05-15-2008, 08:08 AM
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Join Date: Jul 2007
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Sounds like you have never shot at those distances before. I think your equipment is up to the task. Last year I used a Leupold MK 4 3-9 MRT and wouldn't have have hesitated to take a shot at that range, and my targets were quite a bit smaller then an elk. I have never hunted elk but have seen them and they are pretty darn big. Find something the size of an elk, maybe a horse, and set up 700 yards out and look at it through your scope. If you don't think you have enough power then you should change out your scope, but it just sounds to me like you need to go out and shoot....A LOT!
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  #4  
Old 05-15-2008, 12:25 PM
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I have shoot a lot at 200, 300 and a little 400 yard distances but very little past 400. How much do suppose the crosshairs move at 500 yards with no adjustable objective? Thanks for the feedback on the need for an adjustable objective. I have a friend that has a 300 dakota with a leupold 3.5-10x and no adj abj. he has shot goo groups out to 600 and killed a few deer 500+. so I was just wondering if it was a good idea at my hunting distances of 500-700. Thanks Dean
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  #5  
Old 05-15-2008, 12:46 PM
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From what I have always been told, taught, and seen you shouldn't worry about parallax until your mag gets over 10X.
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  #6  
Old 05-15-2008, 04:51 PM
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The forum is divided up into many sections. This is the "Hunting" section.


Down in the foru m section on "Rifles, Equipment, Optics etc " is an Optics section. In the Optics section is stuff on Optics. In the Optics section there one sticky and only one sticky, and I will give you three guesses as to what the stickey is about. If you are unable to guess correctly the subject of that stickey then perhaps someone will come along and give you a hint.

I have personally read that stickey about four times.
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  #7  
Old 05-16-2008, 07:23 AM
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I debated on putting this in the optics section, but I was interested in what hunters thought more than long range target shooters so it ended up here.
Great link it explains the optics very well. Thanks BuffBob.
I didnt see that it answered my question of how far parallax could shift the image by not being centered in the scope of lets say a 10x scope, parallax set at the factory for 150 yards. The article talked about increasing with magnification, distance and how far off the 2 image planes are. But didnt seem to make it easy to figure out. Just wondering if anyone has a real world guestimate. Thanks, Dean
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