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Lets Talk Stepped BC's

 
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  #22  
Old 08-10-2011, 09:30 PM
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Location: Hawkes Bay New Zealand
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Re: Lets Talk Stepped BC's

Before the days of G7's, I used to run seriously stepped G1 BC's for my bullet of choice back then - the 7mm 180gn Berger VLD. These started at .710 out to 1000 yards and then progressively dropped until by 1700 yards I was using .4 G1. This shows how far from the G1 curve the VLD's actually are! Even with G7's I still had to step down beyond 1400 yards, but only a fraction of the G1 stepdown. So far with the Hybrids using G7, both 7mm 180's and the 338 Gen II 300's, we haven't had to step down at all out to 1400, and with the 300's to 1710 yards we also haven't needed to step down. We need to do more extended range testing with the 300's but so far to as far as we're prepared to shoot game in good conditions, the single G7 using "Shooter" is bang on. If you use G1 you'll have to use stepped BC's much beyond 1000 yards in my experience.
Greg
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  #23  
Old 08-10-2011, 09:39 PM
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Re: Lets Talk Stepped BC's

Quote:
Originally Posted by NZ Longranger View Post
Before the days of G7's, I used to run seriously stepped G1 BC's for my bullet of choice back then - the 7mm 180gn Berger VLD. These started at .710 out to 1000 yards and then progressively dropped until by 1700 yards I was using .4 G1. This shows how far from the G1 curve the VLD's actually are! Even with G7's I still had to step down beyond 1400 yards, but only a fraction of the G1 stepdown. So far with the Hybrids using G7, both 7mm 180's and the 338 Gen II 300's, we haven't had to step down at all out to 1400, and with the 300's to 1710 yards we also haven't needed to step down. We need to do more extended range testing with the 300's but so far to as far as we're prepared to shoot game in good conditions, the single G7 using "Shooter" is bang on. If you use G1 you'll have to use stepped BC's much beyond 1000 yards in my experience.
Greg
Thanks Greg, I believe you are pushing the 300 Gen 2's quite a bit faser than I am. So that is probably the difference. But so far it looks as if I will need to step them at about 1400 yds. Time will tell as I still want another day shooting from 1400 to 2000 yrds to double confirm some drops with and with out look angles, and coriolis.

Jeff
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  #24  
Old 08-10-2011, 09:55 PM
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Re: Lets Talk Stepped BC's

Now those last two posts give some interesting info. I'm wondering if NZ hits the same fps at 1710 as Broz does at 1400 given environmentals. Using 2700fps for Broz and 3250 for NZ in Exbal (so vel. banded G1), with the same environmentals, finds about 1900fps for both at the above yardages.
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  #25  
Old 08-10-2011, 10:06 PM
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Re: Lets Talk Stepped BC's

Thats what I'm thinking jmden. I am running them right at 2800 @ 4200 feet.

Jeff
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  #26  
Old 08-10-2011, 10:14 PM
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Re: Lets Talk Stepped BC's

Jmden,
You've got it!
Greg
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