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B.C./Drop Report--MUST READ&COMMENT

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  #8  
Unread 02-02-2010, 01:50 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

I kinda find it hard to try to make a BC claim with out shooting it out at distance. His BC may be very different if he would have shot it at 7-800 yrds. In close it seems that speed will mask BC but at distance your running on BC. I would think that the farther you shoot the less perfect your measurements can be and still be in the ball park also.
I have made dozens of charts only to have them fail at 750 yrd not because of BC but because I failed to input correct data in my enviromentals or measurements.
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  #9  
Unread 02-02-2010, 05:10 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

I got about .85 on my iPod ballistic
MR
There's a big difference between 2 and 2.6@100yds
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  #10  
Unread 02-02-2010, 05:31 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

RockZ, How big was the group that determined this 2" @ 100yds? And the rest of the drops?

A lot of room for error and variation in this kind of scenario. If you want to make any sort of reasonable conclusions you need more precise data and more of it at longer ranges. This simply does not tell you much. I have shot numerous sets of groups from 100 to 600 yds where not every set "fits" into the a particular BC or trajectory. Go out and actually try it some time. Shoot some 3 or even 5 shot groups at 100, 200, 300, 400, 500 yds and you will be lucky if any 3 sets of groups perfectly match a BC trajectory. Then go out and try it again the next day. I can just about guarantee you that your data for the two different days will not match with 1/2" consistantly. Especially with a sporter rifle.

Last edited by MontanaRifleman; 02-02-2010 at 06:25 PM.
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  #11  
Unread 02-02-2010, 05:53 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

MR
you are right about that
but using the drops given and matching them more closely
the BC seems very high
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  #12  
Unread 02-02-2010, 06:08 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

Im sorta new to this but a mv 3500 fps= to a velosity around 3284 fps and at 100 yds. At 300 yds the velosity is 2892 give or take. the drop at 300 yds is around 15 in, and 27 in at 400 yds. The bc may also be incorect. Acording to the math it is .42. I don't know but my math may be all wrong.
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  #13  
Unread 02-02-2010, 07:30 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

I was thinking about this and the question came to mind. Is figuring BC based on trajectory only taking into account the BC from the point where the bullet and scope are zeroed out? Should I be trying to look at it as total drop from the muzzle to range b and c to find a BC that isn't infuenced by scope hight or zero range and height?.
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  #14  
Unread 02-02-2010, 08:02 PM
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Re: B.C./Drop Report--MUST READ&COMMENT

Quote:
Quote:
Originally Posted by RockZ View Post
MR
you are right about that
but using the drops given and matching them more closely
the BC seems very high
On the surface this data seems to indicate a high BC. But within some very close variation or margins of error the BC could be quite "normal". It's like trying to measure a hair with a yardstick.
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