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Drop Cart ??? Need Help

 
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  #1  
Old 10-09-2012, 12:05 PM
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Join Date: Oct 2011
Posts: 170
Drop Cart ??? Need Help

I just made up a drop chart on Vortex's web site. I also made inputs on my SHOOTER APP. Both are relatively close to each other. My question is that it seems like I am getting a lot of drop (thought it would be flatter). 300 RUM 215 Berger Hybrid, Fed 215 Match, 2985fps, 91gr H1000. Altitude is 1000ft, temp 35 pressure 40 humidity 50. Zeroed at 200yds. Vortex says I will have a 7.1 Moa drop @ 500yds and Shooter says 7.0 moa drop or 36.7". This seems like a lot at 500yds. Could some one plug the numbers for me and see what they get? Been shooting quite a bit in developing a load and don't want to waste more barrel life for nothing. Thanks.
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  #2  
Old 10-09-2012, 01:34 PM
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Join Date: Apr 2012
Location: Santa Rosa, NM
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Re: Drop Cart ??? Need Help

Quote:
Originally Posted by BEEMAN View Post
I just made up a drop chart on Vortex's web site. I also made inputs on my SHOOTER APP. Both are relatively close to each other. My question is that it seems like I am getting a lot of drop (thought it would be flatter). 300 RUM 215 Berger Hybrid, Fed 215 Match, 2985fps, 91gr H1000. Altitude is 1000ft, temp 35 pressure 40 humidity 50. Zeroed at 200yds. Vortex says I will have a 7.1 Moa drop @ 500yds and Shooter says 7.0 moa drop or 36.7". This seems like a lot at 500yds. Could some one plug the numbers for me and see what they get? Been shooting quite a bit in developing a load and don't want to waste more barrel life for nothing. Thanks.
What is your B.C Ill run it through my computer.
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  #3  
Old 10-09-2012, 01:45 PM
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Join Date: Oct 2011
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Re: Drop Cart ??? Need Help

BC is .696. Also with my charts and shooter it says at 1000yds my speed is only 1442.4fps. I think with the bergers you should have a impact velocity of 1800fps plus. If my charts are right I could only shoot to 700yds!
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Old 10-09-2012, 02:50 PM
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Join Date: Apr 2012
Location: Santa Rosa, NM
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Re: Drop Cart ??? Need Help

Quote:
Originally Posted by BEEMAN View Post
BC is .696. Also with my charts and shooter it says at 1000yds my speed is only 1442.4fps. I think with the bergers you should have a impact velocity of 1800fps plus. If my charts are right I could only shoot to 700yds!
I used point blank. At 500 it says 32.95in and 2443.79 fps. At 1000 yards it says 212.37in drop and 1963 fps. I don't know what altitude your at so I put in 4600 feet above sea level.
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  #5  
Old 10-09-2012, 03:05 PM
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Join Date: Oct 2011
Posts: 170
Re: Drop Cart ??? Need Help

Thanks I am at 1000ft elevation. Long range is new to me so I guess it will be trial and error. When I get some decent weather I will go and shoot some drops at 600yds. See if these charts are close and validate my muzzle velocity.
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  #6  
Old 10-09-2012, 05:14 PM
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Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Drop Cart ??? Need Help

I ran it across the G7 calc Bryan Litz sends out with his book. I don't have your scope hieght or twist rate so I set the scpe height to 1.8inches and twist rate to 1in11

500 yrds
vel-2342
energy- 2619
drop 6.48MOA
TOF - 0.5672
10mph drift- 2.18MOA

1000 yrds
vel- 1784
Energy- 1519
drop -21.84MOA
TOF- 1.301
10mh Drift- 4.98MOA

Hope this helps
__________________
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #7  
Old 10-09-2012, 05:56 PM
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Join Date: Oct 2011
Posts: 170
Re: Drop Cart ??? Need Help

Thanks Joe King. I re ran some numbers with shooter and used environmentals from my weather station here is what I got: Looks real close except for drift @ 1000 yds. Scope height is 2.23" Twist is 1 in 10.

500 yds
Vel-2334
Energy-2600.6ftlbs
Drop-33" or 6.3 MOA
TOF- 0.569
Drift @ 10mph- 3.3 MOA

1000 yds
VEL-1775.9 fps
Energy-1505.5 ftlbs
DROP-21.7 MOA
TOF-1.306
DRIFT @ 10mph-7.6MOA
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