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A parallax question for veteran shooters

 
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  #1  
Old 09-10-2012, 12:06 PM
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A parallax question for veteran shooters

Hi guys and thanks in advance for your input. I'm shooting a 2.5 to 10 LPS Leupold that does not have a parallax adjustment. its a wonderful scope but does have its limitations past 300 yards. It's my primary predator rig that's called on for double duty on occasion. The gun is an accurized 700 that shoots an honest 3/4 minute to my 250 yard zero with my deer loads. The groups do open up some as I get out to the 500 yard realm and I can only assume in this particular case that parallax is at least a major contributor to the issue. My question to you is "have you ever been able to qualify and/or quantify your medium distance shooting as far as fixed parallax vs. adjustable parallax scopes are concerned ? ". In other words can you share what you have discovered ,in your experience , in your changes in POI with scopes that do and do not have parallax adjustment features in the mid range arena ? Like most scopes this one is set at the factory at 150 yards. Again thanks.
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Old 09-10-2012, 04:35 PM
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Re: A parallax question for veteran shooters

The accuracy you get at 500 won't be the same MOA number that's at 250; they get bigger in subtended angle as range increases. As long as you aiming eye's on the optical axis center, there will be no parallax.
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Old 09-10-2012, 06:38 PM
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Re: A parallax question for veteran shooters

My groups "get bigger in subtended angle as range increases".
I can hit a 1 moa target at 100y, but it is a hail Mary for me to shoot at a 2 moa kill zone at 600 yards.
And the 32 moa moon is much harder than it looks.
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Old 09-10-2012, 08:14 PM
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Re: A parallax question for veteran shooters

A top shooter can shoot a scope with no paralax adjustment just fine. I have shot some great groups the past two weeks out to 1000 yards without a paralax adjustment. You must insure your eye is perfectly centered in the scope. Move your eye in and out and side to side until you get the full field of view in the scope. Your eye will be centered. Do it a few times until you get accustomed to it and your eye naturally going to the center. Watch the reticle move as you move your eye. Just like shooting a bow your eye will adjust to doing the same thing every time. It takes a lot of practice but is doable.
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Old 09-10-2012, 09:29 PM
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Re: A parallax question for veteran shooters

I think some of you guys misunderstood the question. I'm not talking about subtension but rather realistic POI changes from a non adjustable scope vs. an adjustable one ( at the 500 yard mark ). In other words if I employ good bench practices I can blame my load for spreading out rather than my shooting.
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Old 09-10-2012, 09:34 PM
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Re: A parallax question for veteran shooters

I continue to wonder why scope companies and rifle shooters quit calling the process of adusting the front lens group to "focus" on the target the "focus adjustment" or "range focus" made with an "adjustable objective" to parallax adjustment. 'Specially when one's eye is dead center on the scope's optical axis there absolutely no parallax regardless of where the objective's focused at. That front lens works exactly like a camera lens focusing a distant object's image on the reticule plane instead of on film or sensor in a camera.
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Old 09-10-2012, 09:40 PM
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Re: A parallax question for veteran shooters

Quote:
Originally Posted by ballistictip2506 View Post
I'm not talking about subtension but rather realistic POI changes from a non adjustable scope vs. an adjustable one ( at the 500 yard mark ). In other words if I employ good bench practices I can blame my load for spreading out rather than my shooting.
If there's a point of impact change at a longer range (other than what's caused by bullet drop and normal enlargement in MOA), your scope's got something loose inside. There's ways to test it with a collimator stuck in the muzzle, otherwise you may want to send it back to its maker.
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