I finally had the guts to do it!!!

13 May 2008, 08:18

I just came back from the range, and I can officially say that I did it! I finally had the guts to set my chronograph down range just in front of my targets... Most of us set our chronographs 15 feet from the muzzle, get a velocity reading and extrapolate with some fancy computer software what our velocity should be at 100, 200 yards. All this is nice and works in theory but as we all know, B.C. does change with altitude, temperature (Alt Density). So if anyone is interested by my results, here they are.

Altitude: 750 feet
Temperature: 7 Degree Celsius
Range: 100 Yards
Caliber: 375 H&H
Bullet: Barnes 270 Gr TSX
Brass: W-W "Loaded 3 times"
Primer: WLRM
Powder: RE15: 74.0 Gr
COAL: 3.570"

Velocity readings taken at 100 Yards by a Competition Electronics ProChrono Digital.

10 Shot group, Average Velocity: 2380 FPS
10 shot group size was within 1.5 inches

All in all, these Barnes TSX rock on paper!

Cheers,

Mo

13 May 2008, 08:27

RIP

quote:
Originally posted by Enigma:
I just came back from the range, and I can officially say that I did it! I finally had the guts to set my chronograph down range just in front of my targets... Most of us set our chronographs 15 feet from the muzzle, get a velocity reading and extrapolate with some fancy computer software what our velocity should be at 100, 200 yards. All this is nice and works in theory but as we all know, B.C. does change with altitude, temperature (Alt Density). So if anyone is interested by my results, here they are.

Altitude: 750 feet
Temperature: 7 Degree Celsius
Range: 100 Yards
Caliber: 375 H&H
Brass: W-W "Loaded 3 times"
Primer: WLRM
Powder: RE15: 74.0 Gr
COAL: 3.570"
300-grain TSX???

Velocity readings taken at 100 Yards by a Competition Electronics ProChrono Digital.

10 Shot group, Average Velocity: 2380 FPS
10 shot group size was within 1.5 inches

All in all, these Barnes TSX rock on paper!

Cheers,

Mo

13 May 2008, 08:31

Enigma

Thanks RIP. I edited my original post. I was shooting 270gr TSX.

Thanks for noting.

Mo

15 May 2008, 14:10

Will

What "I need" here is the velocity at 15 feet, so one can compare what the expected velocity at 100 yards from the programs to what you measured with the chrony. Right?

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15 May 2008, 16:11

jro45

Thats a real good Idea. That gives you the Actual Ft Lbs at the sight, or shell I say that I could Figure it up, Ft Lbs. I think I'll try that.

15 May 2008, 19:22

onefunzr2

Here's a screenshot of my 375 H&H, shooting factory Remington SP 270gr ammo.

You can see the difference between chronograph (Vel-13), and 100 yards away at the acoustic target, (Vel-T). A loss of about 330fps.

15 May 2008, 21:22

RIP

I can't see that screen shot from this puter.
Is anyone going to provide the velocity of that 270-grain TSX (and maybe the POI) at two diffferent ranges?

Then the BC number could be backed into to compare to what Barnes claims.

17 May 2008, 21:59

Atkinson

Shhhhhhh! don't tell the buffalo, they will shudder and all die of appoplexy at such shananagans!!

18 May 2008, 03:54

33806whelen

gutsy move! I would equate that to trying to hit a golf ball over a water hazard. I know I'll end up in the drink!

Even if I was shooting 1/2" groups, I'd manage to hit at least a screen eventually.