Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

One dead on and one always to the left?

 
LinkBack Thread Tools Display Modes
  #1  
Old 10-23-2012, 03:11 PM
SMF SMF is offline
Junior Member
 
Join Date: Apr 2011
Location: Weaverville, CA
Posts: 17
One dead on and one always to the left?

I'm getting two points of impact from two different loads at the same range. A Berger 168 grain VLD at 2780 FPS is impacting 3/10ths of a mil left if 175 grain SMKs but vertical the same. Same weapon system, same support (sand bags), same shooter. I could understand a higher or lower point of impact but what would cause it the lighter faster bullet to shift to the left? Could it be that the VLD hasn't stabilized at 100 meters? I get the exact same results every time.


Thanks

Steve
Reply With Quote
  #2  
Old 10-23-2012, 03:32 PM
Platinum Member
 
Join Date: Feb 2011
Location: Cincinnati, Ohio
Posts: 1,913
Re: One dead on and one always to the left?

how much is 3/10's of a mill at that distance ( in inches)??
Reply With Quote
  #3  
Old 10-23-2012, 04:57 PM
Platinum Member
 
Join Date: Jan 2008
Location: Northeast
Posts: 2,445
Re: One dead on and one always to the left?

Quote:
Originally Posted by SMF View Post
I'm getting two points of impact from two different loads at the same range. A Berger 168 grain VLD at 2780 FPS is impacting 3/10ths of a mil left if 175 grain SMKs but vertical the same. Same weapon system, same support (sand bags), same shooter. I could understand a higher or lower point of impact but what would cause it the lighter faster bullet to shift to the left? Could it be that the VLD hasn't stabilized at 100 meters? I get the exact same results every time.


Thanks

Steve
I have had that happen over the years on several occasions and believe it to be a specific bullet or load inducing different barrel harmonics causing a different POI.
__________________

"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt
Reply With Quote
  #4  
Old 10-23-2012, 05:13 PM
Silver Member
 
Join Date: Jan 2005
Location: Alaska
Posts: 254
Re: One dead on and one always to the left?

Quote:
Originally Posted by Greyfox View Post
I have had that happen over the years on several occasions and believe it to be a specific bullet or load inducing different barrel harmonics causing a different POI.
I've had the same experience with my .300 WinMag.
__________________
NRA Life Member
Safari Club Life Member
Reply With Quote
  #5  
Old 10-23-2012, 05:17 PM
Gold Member
 
Join Date: Feb 2012
Location: Boise, ID
Posts: 731
Re: One dead on and one always to the left?

What Greyfox said. Bullet weight can be a significant change but any component change can move things around.

.3 mils @ 100 yards is about 1.2 inches.
Reply With Quote
  #6  
Old 10-23-2012, 05:20 PM
SMF SMF is offline
Junior Member
 
Join Date: Apr 2011
Location: Weaverville, CA
Posts: 17
Re: One dead on and one always to the left?

Barrel harmonics, hmmm I didn't even consider that! That would certainly make sense. Thank you sir.

Steve
Reply With Quote
  #7  
Old 10-24-2012, 07:56 AM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,234
Re: One dead on and one always to the left?

That's not to be unexpected.

One of my rifles shoots a Sierra 90 gr hp @3400 exactly 1/2" to the left of where it puts the 130 gr bullet.

Easy adjustment when switching from hunting bigger game to varmints/predators.

All my other rifles shoot one bullet weight.
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: One dead on and one always to the left?
Thread Thread Starter Forum Replies Last Post
300 WSM, Is the M70 dead? RemingtonShooter Rifles, Bullets, Barrels & Ballistics 15 07-11-2012 01:40 AM
Found dead Ram Slopeshunter Sheep Hunting 54 12-05-2011 08:21 PM
Yellowstone is Dead !! Sendero_Man Long Range Hunting & Shooting 0 11-02-2011 10:10 PM
7wsm dead? ishootkittens Long Range Hunting & Shooting 18 01-27-2011 08:49 AM
Back from the dead. Meister Member Introductions 3 03-24-2010 10:11 PM


All times are GMT -5. The time now is 06:45 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC