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175g uld rbbt testing at 800 yards

 
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  #15  
Old 01-17-2007, 09:57 AM
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Re: 175g uld rbbt testing at 800 yards

Mike- Its weird how pressure/humidity has that much effect on bullets. I didn't think it would matter that much. I need to get one of those Kestrel's anyways as my Brunton windmeter took a crap on me right before elk season [img]/ubbthreads/images/graemlins/mad.gif[/img]
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  #16  
Old 01-17-2007, 10:07 AM
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Re: 175g uld rbbt testing at 800 yards

Reed- I haven't tried any 180g VLD's as of yet. I was wanting to, but didn't want to try them if my 9 1/4" wont stabilize them. I'd be more then happy to test a few of the 180's if you have some extra lying around. More just to see if my rifle will stabilize them then anything, then I'll buy a whole box. I did however shoot some 168g VLD's a little earlier and Berger list them at .643. So I entered that along with my velocity at 2950, and my first shots at 800 were dead on. The same went for the 30 cal, 210g VLD. It was advertised at like .640, I entered that and at 1150 yards, I was dead on. I was just surprised that it took so many more clicks to actually get dead on, to me that just means the BC isn't as good as some bullets. I agree that the wildcats are very hard to beat accuracy wise, but like you, I think the Berger VLD's are built a little bit more streamlined, which in turn gives a little higher BC.
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  #17  
Old 01-17-2007, 10:12 AM
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Re: 175g uld rbbt testing at 800 yards

Canute Two- I kinda get what your saying, but its still a little over my head..The elevation where I'm at is actually around 600-700. Like I said, I"ve shot the 168's earlier and they were spot on at .643. I dont have any more of those bullets to shoot side by side, but I know the Berger fly's a little better. The 180g VLD should be even better. I just hope my 9 1/4" will stabilize them.
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  #18  
Old 01-17-2007, 11:52 AM
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Re: 175g uld rbbt testing at 800 yards

Would that be the Kestrel 4000?
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  #19  
Old 01-17-2007, 03:06 PM
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Re: 175g uld rbbt testing at 800 yards

25-06, 600-700 feet of Altitude is going to have a miniscule impact on Pressure which in turn will have a miniscule impact on your ballistics program.

As I understand standard pressures at altitudes (I.E. what your ballistics program will use) 29.53" Hg mercury is the standard for sea level. Every 1000 ft of altitude you increase will decrease the standard pressure 1".... so Roy in Idaho at 4500' asl will have a standard pressure of 4.5" Hg less... or 25.03" Hg.

The problem arises when the pressure for a given day is far from "standard" for that altitude. Supposing your standard altitude pressure @ 700 feet is 28.83"Hg, but the actual station pressure (the true barometric pressure) is 29" Hg, it would have SOME difference, resulting in a lower impact.

How much lower? Did this even have an effect on your shooting results? I don't know and maybe, maybe not respectively. For my .308 loads, via JBM ballistics, 1" Hg pressure drop results in approx. 1 MOA less elevation required @ 1000 yds. That is for a .462 B.C. bullet @ 2750 fps with a 1.5" sight height. I don't know how much 10-11" @ 1000 yards would effect calculating a ballistic coefficient... but 2 feet @ 800 yards would seem to require a SIGNIFICANT barometric pressure change.

I'm rambling, sorry, but after some review of your experience I think the best way to know would be a head to head comparison with a known B.C. bullet.... or find the station pressure for your area and try again.

Either way, let us know more. This has been an interesting thread.
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  #20  
Old 01-17-2007, 07:45 PM
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Re: 175g uld rbbt testing at 800 yards

Here is a little something else to keep in mind: Is your zero a true zero? I had a similar result with the 200 gr AB in my 300 RUM. It was dropping more than my table said it should ( by a couple of clicks @ 800 yds). I compensated by lowering the BC in the program. However, someone on this forum mentioned I might want to double check my zero. I was supposed to be dead-on @ 200 yds, but when I looked closer, I could see that my group could be 1/4 to 1/2 inch low, depending on how I measured it. That translates into more drop the further out you go. Certainly a click or two at 1000 yds. Just a thought.
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  #21  
Old 01-17-2007, 08:13 PM
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Re: 175g uld rbbt testing at 800 yards

I don't know if this is of any use but, at 471 ft. above sea level, approx. 85 degrees. A 9 1/4 twist will hold less than 1 MOA in a 7 WSM running a 180gr. Berger VLD 2775 fps @ 1,000 yards.
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