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Learning MOA Adjustment

 
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  #1  
Old 03-20-2014, 03:12 PM
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Join Date: Jan 2011
Posts: 98
Learning MOA Adjustment

Took my 45 McRem Smokeless Muzzleloader out this morning. It's shooting around 2700fps shooting a Parker Ballistic Extreme with a BC of .250 (book BC is .267). I'm using the Strelok Pro App to calculate adjustment.

My question is once I put all the info in it told me 9.5 moa adjustment for elevation and 2.75 moa adjustment for wind. I did not adjust for wind with the first three shot group to see the affect of wind. Elevation was still 1.5 moa low and the wind correction was very close to being right. I made the elevation and wind correction but added a little to the wind adjustment. The wind adjustment to me was correct however the elevation was off. I thought the BC was of but then it recorrects the wind adjustment also. I'm wondering if the chrono is not reading correct and if so do I back the info down in the app to get correct elevation adjustment?
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  #2  
Old 03-20-2014, 06:05 PM
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Re: Learning MOA Adjustment

So I just got done doing some research and now I wonder if this is the issue. The scope I have has a total of 55 moa adjustment with that said where it's sighted in I only have 15 moa left for adjustment. What I read was because I'm at the end of my adjustment the spring has more pressure on it causing it to not track as accurate, would this be a correct statement? Should I get the offset rings by Burris and get around 30 moa back?
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  #3  
Old 03-20-2014, 08:39 PM
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Join Date: Jan 2012
Location: new zealand
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Re: Learning MOA Adjustment

theres lots of reasons why. and only really you can find out for your particular application.
maybe the crony was having a bad day.
maybe your inputs to the ballistic app were not accurate.
hows the e s on your ammo.
maybe the clicks on your scope arnt a true 1/4 moa at 100

the list goes on. you need to verify your drops in the real world like your doing.
you could adjust the velocity or b.c a bit to get everything to line up.

good luck
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  #4  
Old 03-21-2014, 04:56 PM
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Join Date: Jan 2011
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Re: Learning MOA Adjustment

I have another question. The scope I have has 55moa total adjustment in the scope. I'm sighted in at 200 yards which pours me at the 40th moa mark. So I only have 15 moa left in the scope for elevation. I read that if your in this area of the scope because it's at the end per say of its travel the tracking is not as true. Is this a correct statement?
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  #5  
Old 03-21-2014, 05:30 PM
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Join Date: Jan 2012
Location: new zealand
Posts: 96
Re: Learning MOA Adjustment

If its a good quality scope it should be ok. but if you want more adjustment or your worried about it this is where a canted base comes in. or canted rings, or a shim of some kind to get that adjustment back. if for example you used a 20 moa base then re-zeroed you should have 35 moa left to use.
I use a canted base and burris signature series rings the ones with the plastic inserts. I like them a lot you can change the amount of cant and they hold tight without marking the scope tube.


I hope that helps.
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  #6  
Old 03-21-2014, 08:24 PM
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Join Date: Dec 2006
Posts: 343
Re: Learning MOA Adjustment

Make sure your scope height above the bore is entered correctly in your ballistics program. That will get you. Usually by default they are 1.5" but rarely is that correct.
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  #7  
Old 03-30-2014, 08:29 AM
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Join Date: Feb 2008
Posts: 212
Re: Learning MOA Adjustment

So on the scope height is it measured from the center bore of the rifle to the center of the cross hairs?
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