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Bullet fail...Accubond CT

 
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  #78  
Old 12-03-2012, 11:29 PM
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Re: Bullet fail...Accubond CT

Quote:
Originally Posted by adam32 View Post
We shot again tonight, he had 3 left in his mag from that box. Of course we forgot the chrony, but I'm almost positive that they were NOT shooting at max velocity. He has a Leupold VX-2 with the the crosshair then two dots under it (not sure what reticle that is) and he had the hold the bottom dot! I checked it and it was nearly 20" holdover! That's waaaay too much for a .270 WSM sighted in at 200!

The first shot was low and by the third shot he was on and using the bottom dot on the scope. Switched ammo to the different lot number box, and using the same POA he was a foot plus high. Got dialed in and of course blew the jug up like its suppose to.

I believe he has 2 more from that first box, if he finds them then we will chrony those.

It also makes sense if they weren't quite full power because he's always had trouble with his gun (Benelli R1) ejecting them...
Did you shoot at 300 yards again, if so it would suggest a MV of 1800fps ish with an impact of 1460fps having to use a 20" hold over at 300 yards. That would be a problem with ammo not bullet! I'd find another factory ammo with an accubomb in it!!
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  #79  
Old 12-03-2012, 11:38 PM
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Re: Bullet fail...Accubond CT

Quote:
Originally Posted by bigngreen View Post
Did you shoot at 300 yards again, if so it would suggest a MV of 1800fps ish with an impact of 1460fps having to use a 20" hold over at 300 yards. That would be a problem with ammo not bullet! I'd find another factory ammo with an accubomb in it!!
Yup at 300.

I agree it must be an ammo problem.

He had another box (same stuff, different lot #) and when he switched to it with the same holdover he shot way high! That's when it hit me and I looked thru the scope and looked at the dot he was using and how high it was! Next shot with new point of aim blew the jug to pieces, I then shot one at 200 with the new ammo and blew it to pieces also.

He found two more rounds, one has a broken tip from when it jammed in the gun. I'm going to pull the bullet and measure the powder and compare to the new box. Then reseat the bullet and shoot those last two thru the chrony.
  #80  
Old 12-04-2012, 07:24 AM
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Re: Bullet fail...Accubond CT

I thot it had to start with a velocity problem. Thanks for reporting back.
  #81  
Old 12-04-2012, 01:52 PM
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Re: Bullet fail...Accubond CT

In order to gain a clearer understanding of this incident, it's critical to understand that an Accubond bullet striking the milk jugs at 1500 feet per second will penetrate more 1-gallon jugs of water than an expanding Accubond bullet striking them at 2900 feet per second.

The speed that the original two bullets were launched out the muzzle bears no reflection on the quality of these two Accubond bullets. The pictures of the two expanded bullets looked picture perfect. Especially so considering that they roto-rootered through several feet of turf prior to bouncing up to, and into, the jug. This incident was a fluke. Couldn't repeat those two consecutive results again if you fired another 500 rounds down range.

There's no way to know which of the first two bullets entered the milk jug, given the description of those first two shots, since the milk jug wasn't observed to have moved with either shot. Both bullets ripped through the turf, in spite of the fact that flying mud was only observed with the second bullet.

The only remaining point of curiosity is the MV of the factory ammo.
  #82  
Old 12-04-2012, 02:16 PM
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Re: Bullet fail...Accubond CT

Quote:
Originally Posted by phorwath View Post
In order to gain a clearer understanding of this incident, it's critical to understand that an Accubond bullet striking the milk jugs at 1500 feet per second will penetrate more 1-gallon jugs of water than an expanding Accubond bullet striking them at 2900 feet per second.

The speed that the original two bullets were launched out the muzzle bears no reflection on the quality of these two Accubond bullets. The pictures of the two expanded bullets looked picture perfect. Especially so considering that they roto-rootered through several feet of turf prior to bouncing up to, and into, the jug. This incident was a fluke. Couldn't repeat those two consecutive results again if you fired another 500 rounds down range.

There's no way to know which of the first two bullets entered the milk jug, given the description of those first two shots, since the milk jug wasn't observed to have moved with either shot. Both bullets ripped through the turf, in spite of the fact that flying mud was only observed with the second bullet.

The only remaining point of curiosity is the MV of the factory ammo.
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  #83  
Old 12-05-2012, 06:44 PM
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Re: Bullet fail...Accubond CT

Phorwath's last response is spot on.
  #84  
Old 12-05-2012, 07:09 PM
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Location: Kookifornia
Posts: 409
Re: Bullet fail...Accubond CT

It does make sense that it could've bounced, except that the entry hole was a perfect hole. It should've been oblonged a lot from the mushrooming bullet...

And I know they didn't go thru several feet of dirt because it was softer ground with grass and would've left a "trail" like the other shots from other rifles did.

I don't know for sure what happened, but after seeing that plus the performance on the deer, there's no way that ammo will be coming on the elk hunt.
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