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Lets Talk Stepped BC's

 
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  #1  
Old 08-08-2011, 09:11 PM
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Lets Talk Stepped BC's

If there is info on this already I apologize for the reintroduction. But I would like to hear from some of the ELR shooters here with these questions and perimeters in mind.

1: 1200 yards and beyond out to subsonic distances in the 2000 yards range.

2: Actual proven field data that works in your program, not mathematical formulas that work out great on paper unless you tested and they worked.

So, how do you decide at what velocity to step the BC down?

How do you determin the amount or percentage of reduction?

How many steps do you feel are necessary to 2000 with a bullet in the 2800 fps G1 of .820?

Is t better to use G7 for this or G1 and why?

Thanks

Jeff
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Last edited by Broz; 08-08-2011 at 09:44 PM.
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Old 08-08-2011, 09:50 PM
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Re: Lets Talk Stepped BC's

You may have seen Bryan Litz reference this article (Shooting at 1200 Yards and 1760 Yards (1 Mile) with Bryan Litz Daily Bulletin) when commenting on the posting by Shawn Carlock regarding the Gen II Berger Hybrids.

Bryan is a big proponent of G7. But, Carlock didn't really say for sure which method he used.

Hopefully they'll jump in here and comment.

-- richard
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Old 08-08-2011, 10:02 PM
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Re: Lets Talk Stepped BC's

Thanks Richard. I am not sure if Shawn prefers G1 or G7. But when I was at his class a while back and Shawn and I sent some Gen 2's to past 2300 yrds. I am pretty sure he was using a stepped G1 in Exbal/ NF program. He was helping me with setting this up in my exbal as well. While I was there I mainly used Shooter and a single G7. After I was home and now with all this data I hope to shoot a bit more and have drops perfected to 2000 and maybe a bit further.

As I stretched out past 14 to 1500 it became necessary to add about 1 moa then 1.5 moa. Just by adding this past 1400 I was able to make some 1st round cold bore hits on 1 moa targets. And a second round hit at 2003yds.

So I feel a stepped BC may be the ticket and necessary past 1400 to be in the 1/2 to 1 moa on first round shots.

Jeff
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Last edited by Broz; 08-08-2011 at 10:11 PM.
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Old 08-08-2011, 10:15 PM
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Re: Lets Talk Stepped BC's

I'm sure hoping you get some good input on this Broz, velocity banded BCs are on the list to do with the Nitrided barrel.
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Old 08-08-2011, 10:28 PM
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Re: Lets Talk Stepped BC's

Broz,

Would you mind sharing your 'real world' shooting bc that you've found to work for those longer distances? Are you talking stepping g7 or g1 or just adding a tested amount of moa?

Jon
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Last edited by jmden; 08-08-2011 at 10:33 PM.
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Old 08-08-2011, 10:30 PM
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Re: Lets Talk Stepped BC's

The version of NF Bal that I currently run only supports stepped BCs rather than G7.

So, I'm curious to see what folks say. Regardless, I'm no where approaching what you guys consider ELR as yet.

-- richard
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Old 08-08-2011, 11:05 PM
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Re: Lets Talk Stepped BC's

I asked Bryan Litz in another thread on this topic if he thought it was needed the step the G7 BC for the really long ranges but i got no reply I hope this new threat might shine some light on this by Broz and Bryan
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