Yards vs. Meters !
#11
Nontypical Buck
Join Date: Feb 2003
Location: Eastern wv
Posts: 3,649
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...
Seems to be pretty much exactly one inch for a 300wm from 200-220yrds, whether you have a 100yrd zero or a 200yrd zero...
RR
#12
Typical Buck
Thread Starter
Join Date: Feb 2003
Location: North East PA. but not home.
Posts: 743
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!!!"
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!!!"
#13
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.
#14
Typical Buck
Join Date: May 2009
Location: Colorado
Posts: 797
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.
#15
Fork Horn
Join Date: Nov 2014
Posts: 193
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.
#16
Nontypical Buck
Join Date: Feb 2003
Location: Eastern wv
Posts: 3,649
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.
RR
#17