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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/06/2012 at 19:30
IRON GUTS KELLY View Drop Down
Optics GrassHopper
Optics GrassHopper
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Joined: August/09/2011
Location: Topeka KS
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Points: 27
I purchased some BVAC ammunition and got some weird results...
The factory claims to be 2550fps 150gr. .308 FMJ BT
The seller claims 2850fps.
 
  Yesterday I shot at 200 and 400 yards with good groups but much higher than they should be. I refigured and my results at these distances I have muzzle velocity at 3000 fps.
 
SO. Is it normal to have ammunition performance that severely incorrect?
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/07/2012 at 06:27
Bigdaddy0381 View Drop Down
Optics God
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Georgia peach

Joined: February/27/2007
Location: Georgia
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Give us more detail of your rifle. Is your barrel 4 inches longer than there test barrel? Is your barrel a "tight" barrel? Was the brass showing signs of over pressure? Was the bolt hard to open


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/07/2012 at 07:55
helo18 View Drop Down
Optics Jedi Knight
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Joined: December/02/2006
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Interesting. Waiting dor details.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/07/2012 at 10:16
Bitterroot Bulls View Drop Down
Optics Master Extraordinaire
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Joined: May/07/2009
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IGK,

Just because this load is hitting higher than a different load (even with the same bullet), does not mean the load is any faster. You need to chronograph the load.

Aditionally, 2850 is easily attainable with a 150 gr. bullet in the .308. 2550 would be quite slow.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/07/2012 at 11:39
IRON GUTS KELLY View Drop Down
Optics GrassHopper
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Joined: August/09/2011
Location: Topeka KS
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Points: 27
 
Its a cold hammer forged ceramic coated/lined 20" barrel, 1:10 twist
70F, Alt 950', 80% humidity, unsuppressed
 
I used a ballistic solver and figured drop for 2550 (factory claim) and 2850 (retailers claim)
and using the same ballistic solution program I figured roughly 3000fps by a comparison using the known distances and POA/POI I logged at the range. 
 
I have not had the oppertunity to chrono these rounds... yet.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/07/2012 at 11:42
IRON GUTS KELLY View Drop Down
Optics GrassHopper
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Joined: August/09/2011
Location: Topeka KS
Status: Offline
Points: 27
No signs of anything irregular in the way it fired or extracted.  
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