What does grain mean? - Page 2
You are Unregistered, please register to use all of the features of FirearmsTalk.com!    
Firearm & Gun Forum - FireArmsTalk.com > Handguns > General Handgun Discussion > What does grain mean?

Reply
 
LinkBack Thread Tools Display Modes
Old 07-22-2012, 01:24 AM   #11
Feedback Score: 0 reviews
 
dan01's Avatar
 
Join Date: May 2012
Posts: 133
Liked 18 Times on 17 Posts
Likes Given: 24

Default

I bought a bag of rice that was full of grains and it was heavy.

__________________
dan01 is offline  
 
Reply With Quote
Old 07-22-2012, 01:45 AM   #12
Feedback Score: 0 reviews
 
MrWray's Avatar
 
Join Date: Aug 2011
Location: Oklahoma
Posts: 6,426
Liked 1037 Times on 620 Posts
Likes Given: 16

Default

Quote:
Originally Posted by dan01
I bought a bag of rice that was full of grains and it was heavy.
They make a .45acp fragmentation round with a powdered rice core, its the 230 long grain FMJ
__________________

Semper paratus.....virtute et armis

MrWray is offline  
 
Reply With Quote
Old 07-22-2012, 02:17 AM   #13
Feedback Score: 0 reviews
 
The_Kid's Avatar
 
Join Date: Jan 2010
Posts: 564
Liked 15 Times on 15 Posts
Likes Given: 94

Default

Quote:
Originally Posted by Vincine View Post
Given the same caliber and same load of powder, a heavier gr. bullet will be less affected by wind over distance, but have more of a trajectory drop than a lighter gr. bullet, which would be more affected by wind, but less affected by gravity.

You'll need this for the quiz on Monday.
No, the quiz starts now.

That is an incorrect statement.

1.)Weight is not what cuts wind. Simple answer, better aerodynamics cuts wind better.
This is a link to Hornady's ballistic calculator. (Use the advanced version.)
I'm going to use a generic load as an example, which happens to be my 357 hunting load.
I use a Hornady 180gr HP-XTP with a ballistic coefficient of .23, at a velocity of 1050. The sight height is .7, wind speed of 10, a 100 yard zero with a 200 yard max range; leave everything else as is.

Note the wind drift at 200 yards, 9.5 inches. Now switch the bullet weight to 280grains and calculate. The wind drift is still 9.5 inches.
Put the initial settings in and change the ballistic coefficient to .3 and calculate. The new drift is 7.5, 2 inches less.
A bullet with the same ogive,[the curve of the nose,] that is heavier; is more aerodynamic than its lighter counterpart.


2.) Drop is not subject to weight either. The reason the heavier bullet drops more, is because it is usually traveling slower; it takes longer to get to the target, whereas all bullets fall at 32 feet per second per second.

Another example; put in the initial settings on the ballistic calculator again, then note the 200 yard drop, 37.1 inches. Now up the weight to 280grains and calculate. The drop is the same 37.1 inches.
Now put in the initial settings and change the velocity to 850. The drop is 53.6

Wind at a specific speed as well as gravity are constants that deal with time, so speed is a factor as well as aerodynamics in drift and drop, but weight in and of itself, has no effect.



I might as well mention that, if all other conditions are equal, an increase in bullet weight increases energy.
Again, use the initial calculator readings and note the energy, 317ft-lbs at 200 yards. Up the bullet weight to 280 and you have 494ft-lbs of energy; 177ft-lbs more than the lighter bullet.
__________________
...nuff said.

Last edited by The_Kid; 07-22-2012 at 02:21 AM. Reason: added, "as well as aerodynamics "
The_Kid is offline  
 
Reply With Quote
Old 07-22-2012, 02:20 AM   #14
Feedback Score: 0 reviews
 
libwguns's Avatar
 
Join Date: Jun 2012
Posts: 21
Liked 5 Times on 5 Posts
Likes Given: 6

Default

Quote:
Originally Posted by rjd3282 View Post
7000 grains = 1 lb.
That would be the bullet for this gun, right?

__________________

Discussion? Here? Get real.

libwguns is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
180 grain vs 165 grain in 40 sw FearTheFree7 Ammunition & Reloading 3 07-16-2012 06:28 PM
.40 Which grain ? Riverg420 Ammunition & Reloading 11 02-01-2012 02:07 PM
36 vs 40 grain? kaido .22 Rifle/Rimfire Discussion 9 01-15-2012 04:28 PM
115 grain or 145 grain? PIMking Semi-Auto Handguns 11 06-23-2010 05:19 PM
.243 75 grain v-max CaseyChadwell General Rifle Discussion 4 11-22-2009 12:27 AM