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i need ballistics help

 
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  #1  
Old 03-14-2013, 11:02 AM
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Join Date: Jun 2012
Posts: 24
i need ballistics help

hey everyone, im in the process of ironing out a future rebuild of my r700 243 bdl into a .308 for lrh and ive just realized i screwed up big time in the ballistics dept. i have a leupold vx3 3.5-10x50 scope that has 57 moa elev & wind. and im trying to decide what scope base to get. i just ran some #s over jbm and came up with some results that i would like you guys to double check for me if you would.

bullet-208 amax [.648 g1 bc] @2700 fps
zero @ 100yds
sight height 1.5" [im not sure what to put into jbm for this]
max range 1500 yds
temp -10 f
pressure corrected box checked
std. atmosphere @altitude box checked
alt. 1312 ft asl
this is what i come up with
100-0.0
200-2.3
300-4.9
400-7.8
500-10.9
600-14.3
700-18.0
800-22.0
900-26.4
1000-31.1
1100-36.3
1200-42.0
1300-48.3
1400-55.1
1500-62.6

this is where i messed up, i was under the impression that i had all 57 moa of elev after i zerod the rifle leaving me with roughly 55-56 moa of elev. but, from what ive read i would have half of that elev up [i.e 28 moa up and 28 moa down] if i were to go with a 20 moa base i would run out of elev at 1300 yds. is this right or wrong? im all sorts of confused right now lol. thanks in advance
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  #2  
Old 03-14-2013, 01:27 PM
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Re: i need ballistics help

When you zero you loose a couple of MOA. With a 20 MOA base you "should" end up with about 45 MOA of up. You could also try to shim a little.
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Old 03-14-2013, 03:48 PM
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Join Date: Jun 2012
Posts: 24
Re: i need ballistics help

thanks for clearing up my confusion, i gave it a little thought and decided to go with a 20 moa base and have the scopes reticle changed to mil-dot,after i run out of elev. i can use holdovers. im not gonna let something silly like a scope stop me from takin the 208 amax as far as i possibly can. thanks again
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Old 03-14-2013, 03:59 PM
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Re: i need ballistics help

BTW the G7 for the 208 AMAX is .324
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Old 03-14-2013, 08:37 PM
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Re: i need ballistics help

I would like to know a little more on getting 2700fps with a 208gr Amax out of a 308win? I was thinking the 2400 range.
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  #6  
Old 03-14-2013, 09:03 PM
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Re: i need ballistics help

Quote:
Quote:
Originally Posted by Red hunter View Post
I would like to know a little more on getting 2700fps with a 208gr Amax out of a 308win? I was thinking the 2400 range.
OK.....I am a believer. 308/RL-17/208 AMAX = sweet spot
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Old 03-14-2013, 10:14 PM
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Re: i need ballistics help

Ok, There is alot there that my brain is not grasping. Not calling it BS by no means. It's that Iam not knowledgeable enough of pressures and bullet design. I have not read a Hornady reload manual either. The things that I have to ask are 1. What barrel lenght and twist? 2. Is this listed in the load manual? 3.40 gr bullet weight increase and only 1 gr less powder? And good grief 300win mag velocities out of a 308 with no damage.
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