Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

Velocity and BC?

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-01-2005, 03:12 PM
Bronze Member
 
Join Date: Dec 2003
Location: Utah
Posts: 70
Velocity and BC?

I have a question regarding velocity. I don't have access to a chronograph and the velocities I have posted in the past are not accual readings, rather calculations. I have a 30-06 Ack pushing a 190gr SMK. Sierra publishes a BC of .533 for this bullet. I have made drop charts and for this particular rifle and everything I enter into ANY ballistic calculator gives me erroneous numbers. The reason I ask is either the BC is wrong or the velocity.
For example: At my range I have a 40" rock at 1175 yds. I know that 30.5 MOA dialed in my scope will smack that thing every time. I know that at 875 yds., 16.0 MOA will smack the 24" silouette "dinger." I know that it only takes 5.25 MOA to hit the 500 yard target.
So to get to the meat of the question, is the BC higher than published or am I pushing the SMK faster than what I think am?
I live in Utah at 5300 ft. and the day I shot those targets it was 77* and 0 wind, I mean absolutely no wind whatso ever. I used Jacksonrifles.com ballistic program and to get to 30 MOA (1175 yds.)I had to enter 2950fps. but I was way off at 875 (18.73 MOA) and for 500 (7.81 MOA). I am confused, I guess I'll have to get a chronograph and quite bothering you all.
__________________
"And that law of the land which is constitutional, supporting that priciple of freedom in maintaining rights and privileges, belongs to ALL mankind..." -D&C 98:5-
Reply With Quote
  #2  
Old 10-01-2005, 03:20 PM
Gold Member
 
Join Date: Jul 2005
Location: East TX
Posts: 773
Re: Velocity and BC?

What is your zero range? I'll give it a shot.
__________________
Stephen
Reply With Quote
  #3  
Old 10-01-2005, 03:37 PM
Bronze Member
 
Join Date: Dec 2003
Location: Utah
Posts: 70
Re: Velocity and BC?

Zero range, 100 yds,. I hope someone would.
__________________
"And that law of the land which is constitutional, supporting that priciple of freedom in maintaining rights and privileges, belongs to ALL mankind..." -D&C 98:5-
Reply With Quote
  #4  
Old 10-01-2005, 03:44 PM
 
Posts: n/a
Re: Velocity and BC?

well according to you..
at 500 yards and 5.25 MOA your muzzle velocity needs to be 3450 fps..and that ain't happening with the 190 outta an '06ack
at 875 you need 3225 fps
at 1175 and 30.5 moa ...you need 2900 to 2950 fps and thats hot for an 06 ack..
at 2900fps your 500 yard MOA is 8 your 875 is 19.50 your 1175 is 2900-2950...

sumptin is screwy.. and 40" is over 3 feet.. so where are you hitting that rock???
Reply With Quote
  #5  
Old 10-01-2005, 03:49 PM
Gold Member
 
Join Date: Jul 2005
Location: East TX
Posts: 773
Re: Velocity and BC?

[ QUOTE ]
I know that it only takes 5.25 MOA to hit the 500 yard target.

[/ QUOTE ]

Something is very wrong.

You would have to be shooting the 190SMK @ 3600 fps or so to do that. Double check your numbers?
__________________
Stephen
Reply With Quote
  #6  
Old 10-01-2005, 04:24 PM
Bronze Member
 
Join Date: Dec 2003
Location: Utah
Posts: 70
Re: Velocity and BC?

That's what I am telling you. I know the numbers you have run are accurate, I've run them over and over myself. I figure that 2950 was pushing it, but nothing over 3000 for sure. But I can assure you I hit that 875 "dinger" with only 16.0 MOA!! I've hit "the rock" numerous times with only 30.5 MOA!! The rock, I can put them anywhere you want me too. I'm as baffled as you. I'm not trying to pull any strings, I shoot alot and this all baffles me as well. I dunno, I'm going to have to do something. Thanks for all your replys!!
__________________
"And that law of the land which is constitutional, supporting that priciple of freedom in maintaining rights and privileges, belongs to ALL mankind..." -D&C 98:5-
Reply With Quote
  #7  
Old 10-01-2005, 06:26 PM
Platinum Member
 
Join Date: Feb 2004
Location: Pennsyltucky
Posts: 2,625
Re: Velocity and BC?

the only way to know is to shoot at those ranges with the scope set on 100 yd zero and measure your drop.you're going by how many MOA the scope says it's moving but i'll bet it's moving more than it says.
__________________
davesonlinedeals.com
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Velocity and BC?
Thread Thread Starter Forum Replies Last Post
300 WBY velocity ??? remingtonman_25_06 Reloading 14 12-15-2013 07:20 AM
200 LRX velocity Tikkamike Reloading 1 08-30-2011 04:28 PM
What Velocity with .300 win mag and 210 VLD jayph Rifles, Bullets, Barrels & Ballistics 3 11-17-2010 04:55 PM
7-08 velocity ? winmagman Reloading 0 09-09-2010 06:28 PM
7mm Rem Mag velocity? bosstom Rifles, Bullets, Barrels & Ballistics 5 12-01-2009 06:49 PM


All times are GMT -5. The time now is 03:25 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC