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Am I really spitting these Bergers at 3200 fps????

 
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  #1  
Old 11-17-2013, 11:20 AM
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Join Date: Mar 2013
Location: Arizona
Posts: 119
Am I really spitting these Bergers at 3200 fps????

I've used several ballistic programs to get my drops and I've entered everything as acurately as possible. With every ballistic program I get very very simalar drops (pretty much the same). Using the drops given from the info I put in, I shoot high at all distances past 100 yards. I checked, checked, and double checked everything to see where my mistake was. I couldn't find any. I then went to the range and figured out exactly what my drops were just from shooting and making adjustments. I was given 7.3 moa's for 500 on the balistic programs, but I'm only needing 6 moa's to be right on at 500. With this information it seems that I'm shooting these 168 gr bergers much faster than my chrony says I am. My chrony says 3050 fps, but with my corrected drops it says I'm at 3200 fps. That's fine and dandy, everyone wants more speed right . But my question is, how am I shooting the VLD's at over 200 fps faster than what's listed in the load data I've found and I'm not even at max load? Here is my info just so someone can double check me.

4500 ft elev.
60 degrees
25-30 % Humidity
168 gr Berger VLD Hunting
3050 fps According to my Chrony
2.18" Scope Height
24" Stock Barrel
Rifle info in Signature
Need 6 moa to be right on at 500 yards (A 100% true 500 yards checked by multiple range finders)
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Savage 111 Trophy Hunter XP 7mm Rem Mag
Vortex Viper PST 2.5-10x44 EBR-1 MOA scope
BlackHawk 0 Moa picatinny rail
BlackHawk 30mm rings
BlackHawk Bipod
Rifle Basix Sav-2 Trigger
168gr Berger VLD Huning Bullets
Remington Brass
WLRM Primers
H1000 69.4 grains
Bullets seated .010" off the lands

Howa 1500 .243
Nikon Prostaff BDC 3-9x40
Custom Cherry Wood Stock (Action bedded, barrel floated)
Winchester Brass
87 gr Berger VLD
WLR Primers
Still working on load
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  #2  
Old 11-17-2013, 11:52 AM
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Join Date: Nov 2008
Location: SW Montana
Posts: 4,367
Re: Am I really spitting these Bergers at 3200 fps????

Odds are that your optic is moving more per click than you have in for a value.
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  #3  
Old 11-17-2013, 01:28 PM
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Join Date: Sep 2011
Location: Moorefield WV
Posts: 43
Re: Am I really spitting these Bergers at 3200 fps????

Quote:
Originally Posted by bigngreen View Post
Odds are that your optic is moving more per click than you have in for a value.
I agree
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  #4  
Old 11-17-2013, 01:54 PM
Silver Member
 
Join Date: Mar 2013
Location: Arizona
Posts: 119
Re: Am I really spitting these Bergers at 3200 fps????

This makes sense. I never thought of that before. Thanks.
__________________
Savage 111 Trophy Hunter XP 7mm Rem Mag
Vortex Viper PST 2.5-10x44 EBR-1 MOA scope
BlackHawk 0 Moa picatinny rail
BlackHawk 30mm rings
BlackHawk Bipod
Rifle Basix Sav-2 Trigger
168gr Berger VLD Huning Bullets
Remington Brass
WLRM Primers
H1000 69.4 grains
Bullets seated .010" off the lands

Howa 1500 .243
Nikon Prostaff BDC 3-9x40
Custom Cherry Wood Stock (Action bedded, barrel floated)
Winchester Brass
87 gr Berger VLD
WLR Primers
Still working on load
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  #5  
Old 11-17-2013, 03:28 PM
Silver Member
 
Join Date: Sep 2009
Location: South Dakota
Posts: 396
Re: Am I really spitting these Bergers at 3200 fps????

VERY easy to check that.
Get your zero and fire at 100yds.
Crank up 20 MOA and take a shot. It should impact at 21" (+/- your level of accuracy)
(1.0472" = 1 MOA so 1.0472 x 20 = 20.944 or basically 21")
You can use different adjustments, but I use 20 because it rounds out really close to 21" . Lots of videos online about doing a scope tracking test.

Crank back to zero and take a shot, then crank it 20 MOA down and you should be 21" below your zero.

Some ballistic programs can compensate for tracking issues. If you're dialing 20 and your impacting significantly off, then you need to start a data book to know exactly what you're dialing.



I saw your atmospheric data listed, but didn't see a pressure given.
Even if you're inputing altitude, temp, and humidity...if you don't know your true pressure...you're really just guessing. It doesn't make much difference at 500 but if it's significantly off, it's an issue at longer ranges.

Being off at one range isn't uncommon and velocity could be the issue. First make sure your scope is tracking correctly. If it is...then check your drops at about 4 different ranges, 2, 4, 6 and 800 and you'll be able to calculate your true velocity.
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  #6  
Old 11-17-2013, 05:32 PM
Silver Member
 
Join Date: Mar 2013
Location: Arizona
Posts: 119
Re: Am I really spitting these Bergers at 3200 fps????

Quote:
Originally Posted by c_bass16 View Post
VERY easy to check that.
Get your zero and fire at 100yds.
Crank up 20 MOA and take a shot. It should impact at 21" (+/- your level of accuracy)
(1.0472" = 1 MOA so 1.0472 x 20 = 20.944 or basically 21")
You can use different adjustments, but I use 20 because it rounds out really close to 21" . Lots of videos online about doing a scope tracking test.

Crank back to zero and take a shot, then crank it 20 MOA down and you should be 21" below your zero.

Some ballistic programs can compensate for tracking issues. If you're dialing 20 and your impacting significantly off, then you need to start a data book to know exactly what you're dialing.



I saw your atmospheric data listed, but didn't see a pressure given.
Even if you're inputing altitude, temp, and humidity...if you don't know your true pressure...you're really just guessing. It doesn't make much difference at 500 but if it's significantly off, it's an issue at longer ranges.

Being off at one range isn't uncommon and velocity could be the issue. First make sure your scope is tracking correctly. If it is...then check your drops at about 4 different ranges, 2, 4, 6 and 800 and you'll be able to calculate your true velocity.
Thanks for that. That's some very good info. I'll do just that.
__________________
Savage 111 Trophy Hunter XP 7mm Rem Mag
Vortex Viper PST 2.5-10x44 EBR-1 MOA scope
BlackHawk 0 Moa picatinny rail
BlackHawk 30mm rings
BlackHawk Bipod
Rifle Basix Sav-2 Trigger
168gr Berger VLD Huning Bullets
Remington Brass
WLRM Primers
H1000 69.4 grains
Bullets seated .010" off the lands

Howa 1500 .243
Nikon Prostaff BDC 3-9x40
Custom Cherry Wood Stock (Action bedded, barrel floated)
Winchester Brass
87 gr Berger VLD
WLR Primers
Still working on load
Reply With Quote
  #7  
Old 11-18-2013, 08:54 PM
Junior Member
 
Join Date: Sep 2013
Location: USA
Posts: 22
Re: Am I really spitting these Bergers at 3200 fps????

You can always use a large carpenter rule, somewhere in the 72 version measure out 100 yards and hang the rule vertical using a level. With your gun solid in a gun vise and aiming at the top of the rule you can dial a moa or mil and check the travel, continue and record how accurate it is or how aggressive the click values are. Then make the corrections in your program.

While doing this you will also see if the reticle tracks square with the carpenters rule.

Cheers
oneshot.onehit
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