Go Back  HuntingNet.com Forums > Firearms Forum > Guns
Yards vs. Meters ! >

Yards vs. Meters !

Guns Like firearms themselves, there's a wide variety of opinions on what's the best gun.

Yards vs. Meters !

Old 11-22-2014, 07:54 PM
  #11  
Nontypical Buck
 
Join Date: Feb 2003
Location: Eastern wv
Posts: 3,645
Default

Simple math on it - or rather simple PHYSICS on it: 3000fps, 200yrds = 600ft, neglecting any velocity loss, 600ft/3000ft/sec = 0.2 sec ToF. Drop due to gravity is -32.17 feet per second per second, and the formula to calculate non-propelled gravitational drop is = 1/2 * G * ToF^2 (where G is -32.17ft/s/s and ToF = time of fall) = .5 * -32.17 ft/sec/sec * 0.04 sec*sec * 12"/ft = -7.7" total drop at 200yrds. 220yrds = 660ft, 660/3000 = 0.22 sec ToF, .5*-32.17*0.0484 * 12 = -9.3" total drop at 220yrds. So between 200 to 220yrds, that's about an inch and a half of drop. A guy can make a small correction that for 100 or 200yrd zeroes, you'll peak somewhere between 75-125yrds, so call it 100yrds, so the bullet only starts dropping there. So if you cut off the "rise" part of the trajectory, then you get the drop from 100 to 200 and 100 to 220yrds = 0.1sec vs. 0.12sec, yielding -1.9" vs. -2.8" for 200 and 220yrds respectively. Good for about an inch of drop over those 20yrds - obviously, real world bullets slow down in flight, so those ToF's are too short, and the drop would be slightly more. This math doesn't care about zero'd range, only about Time of Fall.

Seems to be pretty much exactly one inch for a 300wm from 200-220yrds, whether you have a 100yrd zero or a 200yrd zero...
Simple Math? having a redneck deer hunter around who has an education comes in handy, I'll take your word for it NM, your simple math is over my head!!!
RR
Ridge Runner is offline  
Old 11-22-2014, 11:36 PM
  #12  
Typical Buck
Thread Starter
 
Join Date: Feb 2003
Location: North East PA. but not home.
Posts: 743
Default

The reason i had ask is i[A],once in while,I shoot Factory Bench Rest Matches! [B] I didn't know of the Yard/Meter difference at the 2 ranges. [C] I am too lazy to try to figure it out!
The 10 ring spot on a 100 yard BR target is 1/2 inch and on a 200 yd. it is 1 inch,so,it does make a difference!
I started doing this type of shooting years ago and i carry it over to my hunting rifles! It drives me crazy,some times,but my guns all shoot very well.
I see folks at the range at this time of the year,shooting in their deer rifles? I just want to say to them" What do you mean thats good!!!"
mounting man is offline  
Old 11-23-2014, 09:33 AM
  #13  
Giant Nontypical
 
Sheridan's Avatar
 
Join Date: Dec 2007
Location:
Posts: 5,130
Default

Originally Posted by Ridge Runner
Simple Math? having a redneck deer hunter around who has an education comes in handy, I'll take your word for it NM, your simple math is over my head!!!
RR
Ridge,

I thought NoMercy was cursing and just trying to get around the Mods - LOL

I'm a simple guy; I just want sub-MOA accuracy and I still need to learn how to dope the wind better.
Sheridan is offline  
Old 11-24-2014, 02:43 AM
  #14  
Typical Buck
 
Join Date: May 2009
Location: Colorado
Posts: 797
Default

According to most of my ballistic programs my 300WM shooting a 165gr bullet at 3260 fps will drop an average of .5" from 200 yards to 220 yards. The 6mm x 284 shooting a 87gr Vmax at 3440 fps will drop .8" from 200 yards to 220 yards. I did not bother to look up anymore data from there. Gravity is for real.
Blackelk is offline  
Old 11-30-2014, 04:28 AM
  #15  
Fork Horn
 
Join Date: Nov 2014
Posts: 193
Default

It's amazing that even with the "flat and fast" calibers, there is serious drop at ranges. .300 win mag or 7mm is what, -45" at 500 yards (depending on the load)? Really makes you appreciate the skill of long range shooters and snipers that can hit the targets out to 1000 or 1500 yards.
Hartski is offline  
Old 11-30-2014, 04:35 AM
  #16  
Nontypical Buck
 
Join Date: Feb 2003
Location: Eastern wv
Posts: 3,645
Default

Originally Posted by Hartski
It's amazing that even with the "flat and fast" calibers, there is serious drop at ranges. .300 win mag or 7mm is what, -45" at 500 yards (depending on the load)? Really makes you appreciate the skill of long range shooters and snipers that can hit the targets out to 1000 or 1500 yards.
drop is the easy part, if you know how much drop you have at any given range, you can get the bullet there.
RR
Ridge Runner is offline  
Old 11-30-2014, 07:43 AM
  #17  
Giant Nontypical
 
jeepkid's Avatar
 
Join Date: Mar 2006
Location: ****ifornia
Posts: 5,052
Default

Originally Posted by Ridge Runner
drop is the easy part, if you know how much drop you have at any given range, you can get the bullet there.
RR
The 270 Weatherby with a 150 ABLR that my buddy used in Nebraska dropped 201" at 900 yards and held 45" of wind...dead deer.
jeepkid is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.