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How to Identify optics problems?

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  #1  
Unread 02-12-2010, 11:18 AM
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How to Identify optics problems?

I have a 7mm RM in a sendero SF with a leupold mark4 PR 4.5-14x40 30mm SF. I loaded up 3 162gr hornady sst bullets with 63.5 of rl 22 shot dead on on the first shot, low on second, a little left on the third. Loaded up 65 grains of rl 22 on the next day, cleaned my barrel, and taped new target over the old one. Shots 1,2,and 3 went in the same holes as 1,2,and 3 of the prior day. I looked through old targets and there is a significant history of this gun doing this. This gun almost always places the first second and third holes in the same places at the start of a new day. Is this optics problems? Shoots no more than a 1inch group most of the time and occasionally 3/8 to 1/2 inch groups with really light loads.
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  •   #2  
    Unread 02-12-2010, 11:23 AM
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    Re: How to Identify optics problems?

    I thnk I'd look more to bedding or loose action screws if this is a constant problem. Also, what does it do after the first 3 shots ?
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      #3  
    Unread 02-12-2010, 11:30 AM
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    Re: How to Identify optics problems?

    Doesn't sound like a scope problem to me. How deep are you cleaning? Bare metal?
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      #4  
    Unread 02-12-2010, 12:14 PM
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    Re: How to Identify optics problems?

    Do you clean after every trip to the range? I found I was over doing the cleaning and it took a few rounds to settle it down, I stopped stipping it all the way down everytime I clean and the last patch is Kroil and it seems that now that that has gone away but I ahve only done it twice but it got rid of my cold bore shot going slightly low and left. Other than that, bedding or how you settle down while shooting.
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      #5  
    Unread 02-12-2010, 12:19 PM
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    Re: How to Identify optics problems?

    I have a 7mm mag that does almost the same thing with a clean barrel. It will string the first three shots and then group 5/8" until the barrel gets real dirty maybe 50 to 60 rounds later. You might try shooting with a fowled barrel.
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      #6  
    Unread 02-12-2010, 02:17 PM
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    Re: How to Identify optics problems?

    Quote:
    Originally Posted by clamb4 View Post
    I have a 7mm mag that does almost the same thing with a clean barrel. It will string the first three shots and then group 5/8" until the barrel gets real dirty maybe 50 to 60 rounds later. You might try shooting with a fowled barrel.

    +1 to the, "too clean of a barrel."

    Tank
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      #7  
    Unread 02-12-2010, 03:31 PM
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    Re: How to Identify optics problems?

    It does this if it is clean or dirty. The more shots in one session it settled into a pretty tight group, but the group is to the left. Like I said, the first shot of each day goes in the same hole 95% of the time. The action and floor plate is bedded. The recoil lug is bedded in the rear and .010" from front and bottom. It really seems strange that it will duplicate shots shots like this. I've made three quick shots at times and waited up to 30 min. between shots at times with no difference. Something is settling back to origional condition, but it takes a long time(>30min) to do it.
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