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# Where is the balance between weight and speed?

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#15
10-11-2013, 04:24 PM
 Gold Member Join Date: Jan 2013 Posts: 872
Re: Where is the balance between weight and speed?

Am I wrong in reading that the trade off part is more about shooting a "slightly" lighter bullet at higher rate of speed then a "slightly" heavier bullet at a slower speed?

For example, at 1000 yards 140 grain bullet vs 160.

140 VLD at 2900 fps: at 1000 velocity is 1879 with 1097ft lbs

160 VLF at 2700 fps: at 1000 velocity is 1796 with 1146ft lbs.

If I am reading this thread right the idea is which of these two scenario is goin going to produce the most lethal results? Do you take the velocity or the energy?
#16
10-11-2013, 05:01 PM
 Gold Member Join Date: Oct 2007 Posts: 750
Re: Where is the balance between weight and speed?

Quote:
 Originally Posted by BrentM Am I wrong in reading that the trade off part is more about shooting a "slightly" lighter bullet at higher rate of speed then a "slightly" heavier bullet at a slower speed? For example, at 1000 yards 140 grain bullet vs 160. 140 VLD at 2900 fps: at 1000 velocity is 1879 with 1097ft lbs 160 VLF at 2700 fps: at 1000 velocity is 1796 with 1146ft lbs. If I am reading this thread right the idea is which of these two scenario is goin going to produce the most lethal results? Do you take the velocity or the energy?
I am trying to dupe your numbers.

Berger makes a 140 vld in 6.5mm.

Who makes the VLF in 160 grains. And is it in 6.5 cal?

I was just going to run the windage on your two examples.

Thanks,
Tod
#17
10-11-2013, 05:08 PM
 Platinum Member Join Date: May 2008 Location: South of Canada and North of Wyoming Posts: 5,408
Re: Where is the balance between weight and speed?

Quote:
 Originally Posted by BrentM Am I wrong in reading that the trade off part is more about shooting a "slightly" lighter bullet at higher rate of speed then a "slightly" heavier bullet at a slower speed? For example, at 1000 yards 140 grain bullet vs 160. 140 VLD at 2900 fps: at 1000 velocity is 1879 with 1097ft lbs 160 VLF at 2700 fps: at 1000 velocity is 1796 with 1146ft lbs. If I am reading this thread right the idea is which of these two scenario is goin going to produce the most lethal results? Do you take the velocity or the energy?
As far as I can tell, the OP is looking for advantage of trajectory allowing a greater margin of error at longer ranges.

Quote:
 The 190 gives you a 30" flatter trajectory at 1000yds. That is a lot more room for error in a hunting situation where lets say a deer is at 750yds when you range it then he moves to 780 before you take the shot. I know a bullet of that weight class has plenty of energy at those ranges because I see the Best of the West guys spanking stuff at 900-1100 yds with 168gr berger 7mm.
What the OP may not realize is that the OVERALL trajectory to a 1000 yds is 30" difference (which is not much) BUT the RATE OF DROP is going to be almost identical between the 2 bullets he's talking about. So no advantage for greater margin of error from the faster lighter bullet.
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#18
10-11-2013, 05:41 PM
 Gold Member Join Date: Jan 2013 Posts: 872
Re: Where is the balance between weight and speed?

6.5 yes. VLF= NO, that is a typo, it is a VLD. Made in Canada, Matrix.

I know it is not a .308 caliber. Just trying to understand the topic better. I go back and forth on which I should use. The 140 gets there faster but hits less hard.

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