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Kahles Scope Variability

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/03/2011 at 13:33
wereynol View Drop Down
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I have recently purchased an Interarms .375 H&H with a Kahles scope (Helia 1.5-6), age unknown, and during my shooting sessions at the range, my zero will change 6" or more between strings of 3-5 shots.
I have checked all the mounting screws and am shooting off a lead sled at 100 yards.  The action is tight in the stock (wood) and there do not seem to be any loose parts on the scope body.  As I am leaving for Africa and this is my back-up buffalo rifle, I am concerned that there may be something wrong with the scope. Any thoughts would be welcome.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/03/2011 at 14:13
Gerry Atric View Drop Down
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It could be a defect scope, but Helia´s usually solid as.
Do I understand you correctly - You shoot 3-5 shots and then 3-5 shots and POI has shifted 6" ?
 
Do you allow the gun to cool down between your strings? You could have a POI-change due to barrel heating.
If you don´t: Next time on the range shoot 3 shots - wait 10-15 minutes - then try another 3 shots.
If you still have this POI change - put another scope on and try again.
 
Gerry Atric
 
 
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/03/2011 at 17:34
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I'd definitely consider taking a different scope, even if it isn't a defective scope, you've lost confidence in it.  Hunting dangerous game requires utmost confidence in ones equipment. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2011 at 09:45
wereynol View Drop Down
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I went back to the range this morning and it held it's zero from yesterday, but I must admit that having it change while I'm in Africa is concerning.  I may mount a previously purchased Leupold 1.5-5x on a different set of mounts and take it along.  Convincing myself not to take this very nice scope is hard, but you're right about trusting your gun when hunting buffalo.  Bullets going somewhre besides the aimed point of impact sounds like a whole lot of trouble.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2011 at 15:09
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Did you follow Gerry Atric's advice? If you shoot too many rounds too fast it heats up the barrel and that has changed the zero for some of my guns. But when I let it cool back down it returns to the original zero.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2011 at 17:04
Son of Ed View Drop Down
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Get another scope.  A fixed power.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2011 at 19:13
koshkin View Drop Down
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It may be the rifle or the scope.  Hard to say without swapping the scope out and checking it.

Either way, 6 inches at hundred years is well within a "minute of buffalo".

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/05/2011 at 07:26
lumberjack149 View Drop Down
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what kind of groups does this rifle normally hold with this ammo? Is it not grouping at all or is it holding decent groups and just shifting the POI?

To add one more thing to this post... we dont know much about your rifle/ammo combo, but 6" at 100yds is not out of the question for a bad ammo/rifle combo. I have a lightweight pencil barrel AR that will shoot 6" or so groups with cheap ammo and then turn around and shoot 1.5" groups with good ammo. Also someone can get 3 shot groups to be fine with cheap ammo (lucky 3 shots) and then have the next 3 shots open the group wide up. This is why most people would recommend 5 to 10 shot groups to find the true accuracy of your setup. Just a thought.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/05/2011 at 09:42
wereynol View Drop Down
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The loads are 75 grains of H414 with Remington nickel cases, CCI primers and I use an electronic powder scale for measuring the loads. The bullets are Barnes 300 grain TSXs.  The rifle will group three shots and then group three shots in a new location on the third or fourth string.  The groups are 1 1/2" at 100 yards.  While the last set didn't do this, it is worrisome.  Gun cooling is allowed between strings, but not back to ambient temperture. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/05/2011 at 13:58
Gerry Atric View Drop Down
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As Koshkin says; scope or rifle
 
Try another scope (a known good one), if the problem remains it´s the rifle.
 
Don´t know the quality of Interarms rifles, some wooden (high recoil) rifles are known to crack around the recoil lug.
 
You are experiencing the worst thing that can happen - a multitude of causes.....
Try to eliminate them one at the time.
 
Gerry Atric
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