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AZ_SAWBUCK

NEED HELP WITH A VORTEX SCOPE

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Barometric pressure changes same as elevation changes. The higher the elevation the lower the barometric pressure.

 

This is a chart of true barometric pressure per altitude

 

Altitude. Pressure

 

1000 28.9

 

1500 28.3

 

2000 27.8

 

2500 27.3

 

3000 26.8

 

3500 26.3

 

4000 25.8

 

4500 25.4

 

5000 24.9

 

6000 24.0

 

7000 23.1

 

8000 22.2

 

9000 21.4

 

10000. 20.6

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The way to measure scope height as outlined in applied ballistics for long range shooting is this. Measure the dia of your scope bell and divide by two. Measure the dia of your barrel at the end of your scope bell and divide that number by two. Then measure the distance from the bottom of the bell to the top of the barrel and add them all together to get your scope height. Most scopes with 50mm objectives end up being at least 1.8 if not a bit more. That all depends on scope design and ring height.

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Well I got her dialed in! I met with a buddy and shot through a chronograph. Turns out that my zero for elevation was way off some how. I also ended up switching to a heaver bullet, 180 gr. Federal Fusion.

 

The bullet Chronographed at 2991 fps. So I took this info and made a new chart on the Vortex website. Laid down with a bipod and a good rest under the stock and shot decent group at 350. After a small windage adjustment I backed up to 600 and was very pleased with my group. Those WT bucks don't stand a chance in 24B next week! Thanks for all the suggestions your input really helped!

post-6362-0-76714100-1414678623_thumb.jpg

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